The Canadian Centre for Cyber Security has warned that a now-patched Roundcube Webmail vulnerability is being actively exploited in the wild. The vulnerability in question is CVE-2026-48842 (CVSS score: 8.1), a pre-authentication SQL injection in the virtuser_query plugin of Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1. The issue stems from a preg_replace() backslash
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A flaw in Cloudflare Containers let a paying customer read data that other customers' containers had left behind on the same server, Cloudflare and the researchers who found it said on Thursday. The data came from disk space that earlier containers had used and given up, not from any live workload, and an attacker could not choose whose data they got, according to Cloudflare. The company
ThreatsDay: AI Search Poisoning, AI Coding Tool Leaking Repos, One-Click Code Execution and 13 More Stories
This week, the dangerous stuff keeps arriving dressed as something boring. An update. A login box. A search answer. A coding tool. A link you have clicked a hundred times before. That is the thread running through the pile. Trusted paths get poisoned. Old bugs find new jobs. AI tools leak more than expected. Fake prompts look real enough. And some attacks barely need an exploit at all — just
VU#676317: Norwegian Cruise Line door access controller contains an improper authentication vulnerability
Overview Door access controllers used on Norwegian Cruise Line (NCL) ships contain an improper authentication vulnerability that permits a replayed unique identifer (UID) from a radio-frequency identification (RFID) device to grant unauthorized entry to areas secured by these controllers. Description Norwegian Cruise Line is a global cruise company that operates a modern fleet sailing to destinations worldwide. As described in CVE-2026-75907 , the affected card reader authenticates NFC credentials only by checking their static 7-byte UID. A UID is not a secret and does not support cryptographic challenge‑response operations, so it cannot serve as a reliable authentication factor. Although the keycard's NTAG212 tag contains a memory block with a printed serial number and a value resembling a signature, the reader does not inspect this data during the access-control process. Validation based solely on UID constitutes identification rather than authentication. Because the credential performs no cryptographic exchange and offers no defense against cloning, any device capable of replaying or emulating UIDs can reproduce a functioning keycard. Impact An attacker with brief physical proximity to a valid keycard can use an RFID reader to capture the UID without interacting with or altering the card. Once obtained, this UID can be copied to an inexpensive UID‑writable card to create a permanent duplicate credential. The access control readers will accept these forgeries as genuine, granting entry. Depending on logging configuration, the unauthorized entry may be indistinguishable from legitimate use. Because unauthorized access to restricted areas on a cruise vessel can have direct safety implications, this vulnerability presents a significant security risk to both internal operations and guest
The country’s prime minister expressed disappointment at being informed of the hack only via email. Now Australia is investigating whether OpenAI broke the law.
Latest
Friday, September 25
The Canadian Centre for Cyber Security has warned that a now-patched Roundcube Webmail vulnerability is being actively exploited in the wild. The vulnerability in question is CVE-2026-48842 (CVSS score: 8.1), a pre-authentication SQL injection in the virtuser_query plugin of Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1. The issue stems from a preg_replace() backslash
ubuntils v2.0.0 – forensic triage for Ubuntu: collect artifacts, correlate a timeline, and detect 15 persistence/tampering techniques (fully offline)
Hey all, I've been building **ubuntils**, a Python CLI/TUI for forensic triage on Ubuntu — the idea is to replace the "run the same 10 manual commands and hope you didn't miss one" first-30-minutes ritual of incident response with a single tool that does collection, detection, and timeline correlation automatically. **How it works (4 stages, \~3s total on a live host):** 1. **Collect** — 11 collectors gather artifacts concurrently (processes, network, cron, systemd, SSH, sudoers, users, packages, PAM, kernel modules, environment) 2. **Detect** — 15 built-in rules (+ custom YAML rules if you want) run over everything, ranked by severity 3. **Timeline** — correlates syslog/journald/auditd chronologically and auto-attaches related events to each finding 4. **Output** — interactive 4-tab TUI (Summary/Findings/Timeline/Stats) or `--json` **What it catches:** the usual suspects (cron persistence, LD\_PRELOAD injection, suspicious systemd timers, new SSH keys, NOPASSWD sudoers, UID-0 backdoors) plus a newer "coverage pack" — tampered package files (`dpkg --verify`), immutable/append-only flag abuse, PAM/NSS backdoors, suspicious kernel modules, and unexpected setuid binaries. **New in v2.0.0 — offline collect/analyze split:** * `ubuntils collect` grabs a tamper-evident bundle (hashed files + commands, SHA-256'd manifest) from a host with no detection running * `ubuntils analyze bundle.tar.gz` (or `--root /mnt/image` for a mounted image) runs the full detection/timeline pipeline later, elsewhere, without root * Bundle integrity is verified and reported (`live` / `ok` / `mismatch`) * Confidence scoring on findings (0–100, with an explainable signals breakdown) instead of a flat mtime heuristic * Docs are upfront about what offline analysis *can't* see compared to a live scan — no silently pretending it has parity **Also has:** * Two-step remediation (dry-run by default, `--confirm` to apply) with automatic backups, symlink guards, and rollback commands — 5 of the 15 rules are auto-remediable, the rest are flag-only by design since they need a human to judge * Wazuh integration — if a Wazuh agent is present, findings get appended as JSON lines automatically, no flag needed * Zero network calls, ever — even dropped a planned VirusTotal hash-lookup feature to keep that guarantee absolute * 90%+ test coverage, MIT licensed ​ sudo apt install pipx -y && pipx install -e . && sudo ubuntils scan **GitHub:** [https://github.com/asmitdesai/ubuntils](https://github.com/asmitdesai/ubuntils) Feedback, bug reports, and PRs (especially new detection rules or collectors) very welcome — Discussions and issue templates are set up.
ceasta: open-source disassembler, decompiler and debugger in one, with a built-in MCP server for driving it from an AI
A flaw in Cloudflare Containers let a paying customer read data that other customers' containers had left behind on the same server, Cloudflare and the researchers who found it said on Thursday. The data came from disk space that earlier containers had used and given up, not from any live workload, and an attacker could not choose whose data they got, according to Cloudflare. The company
**(1)** An exposed IOCTL lets unprivileged users disable the x86 [MONITOR](https://www.felixcloutier.com/x86/monitor) & [MWAIT](https://www.felixcloutier.com/x86/mwait) instructions used by [Hyper-V](https://en.wikipedia.org/wiki/Hyper-V) and other kernel components--triggering a HYPERVISOR\_ERROR bugcheck. **(2)** Reaching the IOCTL requires exploiting a [TOCTOU](https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use) bug arguably caused by poor documentation of the [SeLocateProcessImageName](https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/nf-ntifs-selocateprocessimagename) function. **(3)** Reimplementation of the driver's security through obscurity IOCTL encryption scheme: SHA-256 KDF-derived XOR keystream & CRC16 Checksum. See [full write-up](https://connorjaydunn.github.io/blog/posts/argus-monitor-ldos-cve-2026-79417/), and [Github](https://github.com/connorjaydunn/CVE-2026-79417) for PoC.
Thursday, September 24
An isolation failure in an LLM-orchestrated environment due to simple isolation misconfigurations led to Rovo sessions belonging to other users and tenants being discovered, reached, and ultimately used to execute code within their contexts. The finding was rated Critical and is pretty bad. At this point, I feel like AI security is regressing back to simple misconfigurations, except now we're giving users direct access to systems built on top of them. What do you guys think? Write-up: [https://mononclemich.medium.com/so-apparently-rovo-has-neighbors-88998d0ad59c](https://mononclemich.medium.com/so-apparently-rovo-has-neighbors-88998d0ad59c)
Built a lightweight, zero-dependency LSASS dump detector and handle table auditor in pure Python (Win32/NT ctypes)
Hi all, OS credential dumping targeting LSASS (T1003.001) remains one of the primary post-exploitation techniques in Windows environments. While modern enterprise EDRs have robust kernel callbacks, I wanted to build a transparent, standalone Python utility to inspect how handle table analysis and memory access masks can detect dumper behavior at the endpoint level. The tool is called \*\*MemGuard\*\* (MIT licensed, zero dependencies): GitHub: [https://github.com/prox0959/MemGuard](https://github.com/prox0959/MemGuard) \### 🛠️ Key Mechanics: 1. \*\*Handle Audit:\*\* Queries \`NtQuerySystemInformation(SystemExtendedHandleInformation)\` to map which processes hold active handles to \`lsass.exe\`. 2. \*\*Access Mask Filtering:\*\* Specifically flags unauthorized processes granted \`PROCESS\_VM\_READ\` (\`0x0010\`) while whitelisting core system services (\`csrss.exe\`, \`services.exe\`, Windows Defender). 3. \*\*PEB Inspection:\*\* Direct memory read of \`PEB->ProcessParameters->CommandLine\` via \`NtQueryInformationProcess\` to detect LOLBin dump attempts (e.g. \`comsvcs.dll MiniDump\` or ProcDump flags). 4. \*\*Active Triage:\*\* Supports freezing suspect processes via \`NtSuspendProcess\` rather than immediate termination, maintaining volatile RAM for artifact recovery. Would love to hear thoughts from detection engineers and blue teamers on edge cases or bypasses you'd anticipate (e.g. handle stripping, direct kernel object manipulation). Feedback and GitHub stars are always welcome!
VU#234131: ViewSonic vCast media streaming service allows unauthenticated screen exfiltration and device compromise
Overview ViewSonic vCast software, which is included in ViewBoard smartboard devices, contains multiple vulnerabilities that an attacker can chained to achieve full device compromise. Description ViewSonic ViewBoards are widely used smart display devices (smartboard), typically deoloyed in enterprise and educational environments. vCast is ViewSonic’s proprietary software suite for wireless connection between smartboards, which are Android-based systems, and devices running a client application. Three distinct vulnerabilities, all invoking unauthenticated endpoints, have been identified within the vCast suite. CVE-2026-82989 vCast’s media streaming service allows a remote attacker to exfiltrate JPEG images of screen content via GET requests to an unauthenticated /snapshot or /screen API endpoint. CVE-2026-82988 vCast’s Android Package Kit (APK) delivery mechanism allows a remote attacker to trigger unprivileged file installation by providing a malicious APK URL through an unauthenticated download endpoint. CVE-2026-82987 vCast’s network services allow a remote attacker to inject arbitrary input into service endpoints via HTTP requests to exposed unauthenticated endpoints Impact An unauthenticated attacker can chain these vulnerabilities via a shared network to deliver and execute arbitrary code on a vCast-based device without user interaction. Potential device-level impact includes unauthorized access to displayed content, persistent installation and execution of arbitrary applications, and full compromise of the device. Additionally, an exploited device’s connected network may be prone to lat
A OnePlus 15 running the latest OxygenOS can be rooted by a malicious app the owner installs, one that asks for no special permissions. A researcher, Rasmus Moorats, chained two flaws in OnePlus's own software to gain root access, the highest level of control over an Android phone. OnePlus told him the same flaws affect many more of its own devices and those of OPPO, though it has not
Careful of the RemotePanel and BoundSiphon: A Dual-Payload Toolkit for Persistent Access and Browser Theft
**Tl:dr** * **Blackpoint’s Adversary Pursuit Group (APG)** identified two previously undocumented .NET malware components delivered together through a ClickFix chain: **RemotePanel**, a persistent remote access platform, and **BoundSiphon**, a credential and cryptocurrency stealer. * RemotePanel establishes persistence by masquerading as the Windows Time service and gives operators broad control over infected systems, including PowerShell, file and process management, screen access, modular HVNC, and fleet management. * RemotePanel uses a BNB Smart Chain contract to resolve its active Command and Control (C2) server, allowing operators to rotate infrastructure without rebuilding or redeploying the RAT. * BoundSiphon runs primarily from memory and targets browser credentials and sessions, cryptocurrency wallets, password manager data, and selected documents, including secrets protected by Chromium App-Bound Encryption. * APG identified strong code and build overlap between BoundSiphon and a stealer [previously documented by Socket](https://socket.dev/blog/5-malicious-nuget-packages-impersonate-chinese-ui-libraries), linking the sample to an earlier stealer codebase or builder lineage. * **APG is seeking additional research and samples tied to RemotePanel, BoundSiphon, the AntiSNG implementation, Socket linked stealer activity, and the BNB Smart Chain resolver to help connect the remaining lineage and infrastructure gaps.** * RemotePanel and BoundSiphon reflect a broader shift toward modular malware ecosystems that separate persistent access from data theft, allowing operators to replace infrastructure and individual components while retaining the underlying capabilities needed to continue an operation. * For victims, a single successful infection can lead to persistent remote access and theft of credentials, browser sessions, cryptocurrency wallets, password manager data, and other sensitive information, increasing the risk of account takeover, fraud, and continued compromise. * Blackpoint has detections in place for key behaviors across the infection chain, providing coverage even as individual payloads and infrastructure change.
ThreatsDay: AI Search Poisoning, AI Coding Tool Leaking Repos, One-Click Code Execution and 13 More Stories
This week, the dangerous stuff keeps arriving dressed as something boring. An update. A login box. A search answer. A coding tool. A link you have clicked a hundred times before. That is the thread running through the pile. Trusted paths get poisoned. Old bugs find new jobs. AI tools leak more than expected. Fake prompts look real enough. And some attacks barely need an exploit at all — just
VU#676317: Norwegian Cruise Line door access controller contains an improper authentication vulnerability
Overview Door access controllers used on Norwegian Cruise Line (NCL) ships contain an improper authentication vulnerability that permits a replayed unique identifer (UID) from a radio-frequency identification (RFID) device to grant unauthorized entry to areas secured by these controllers. Description Norwegian Cruise Line is a global cruise company that operates a modern fleet sailing to destinations worldwide. As described in CVE-2026-75907 , the affected card reader authenticates NFC credentials only by checking their static 7-byte UID. A UID is not a secret and does not support cryptographic challenge‑response operations, so it cannot serve as a reliable authentication factor. Although the keycard's NTAG212 tag contains a memory block with a printed serial number and a value resembling a signature, the reader does not inspect this data during the access-control process. Validation based solely on UID constitutes identification rather than authentication. Because the credential performs no cryptographic exchange and offers no defense against cloning, any device capable of replaying or emulating UIDs can reproduce a functioning keycard. Impact An attacker with brief physical proximity to a valid keycard can use an RFID reader to capture the UID without interacting with or altering the card. Once obtained, this UID can be copied to an inexpensive UID‑writable card to create a permanent duplicate credential. The access control readers will accept these forgeries as genuine, granting entry. Depending on logging configuration, the unauthorized entry may be indistinguishable from legitimate use. Because unauthorized access to restricted areas on a cruise vessel can have direct safety implications, this vulnerability presents a significant security risk to both internal operations and guest
The "third-party[.]com" domain, commonly used as a documentation placeholder, has been observed serving a ClickFix lure to Windows browsers while displaying a harmless decoy to other users. "third-party[.]com has been a generic documentation placeholder for years, the same role example.com plays," Manifold Security's Head of Research, Ax Sharma, said. "Unlike 'example[.]com,' third-party[.]com
An active ClickFix campaign has been observed compromising legitimate Ukrainian business websites to inject bogus Cloudflare verification pages and trick victims into downloading a previously undocumented information stealer called Psychedelic. "When a visitor interacts with the page, the lure copies a Windows Installer command to the clipboard and instructs the visitor to paste it into the
The logistics sector has become the target of a new malicious cyber campaign that distributes an Android spyware codenamed Corp MDM. According to Have I Been Squatted, the campaign uses fake Google Play pages branded as CEVA and TKW Logistics to distribute an Android Package Kit (APK) file that's dressed up as a system service. The delivered app has the package name "com.corp.mdm" Corp MDM
AI coding agents are changing how quickly developers can build and ship software as well as how quickly credentials can become exposed. According to GitGuardian’s 2026 State of Secrets Sprawl Report, commits identified as AI-assisted are leaking secrets at approximately twice the rate of human-written ones. Most of the fastest-growing categories of leaked credentials are now connected to AI
The country’s prime minister expressed disappointment at being informed of the hack only via email. Now Australia is investigating whether OpenAI broke the law.
Former deputy PM now involved in tech industry says many within sector are ‘winding themselves up into a lather’ Nick Clegg has dismissed fears over AI’s “godlike power to exterminate humanity”, calling it a sign that tech bosses are “breathing their own fumes”. The former UK deputy prime minister said that tech bosses should focus on addressing known specific threats such as cybersecurity and bioweapons rather than the “slightly hand-wavy view that this technology is unavoidably going to develop some godlike power which is going to turn on us and exterminate humanity”. Continue reading...
ClickFix has become the most common way attackers get into enterprise networks, and it does it without an exploit, an attachment, or a file on disk. Our new global threat report traces the technique from a novelty in late 2023 to a subscription product with on-chain infrastructure and a state-sponsored user base, and explains why blocking malicious domains is no longer a useful defense. Read
Cybersecurity researchers have disclosed details of an active TeamFiltration campaign codenamed UNK_CondorFiltration that has targeted over 5,700 accounts across 28 Microsoft 365 tenants. According to Proofpoint, the activity has primarily focused on Chilean retail and financial institutions. It originated from 1,487 unique AWS EC2 source IP addresses. "The campaign compromised 7 accounts –
Threat actors have begun to actively exploit a critical security flaw in WordPress within hours of public disclosure. The vulnerability in question is CVE-2026-87902 (CVSS score: 9.2), which could allow an unauthenticated attacker to obtain remote code execution (RCE). "An unauthenticated attacker can make get_page_template() page-template resolution include a chosen readable local .php file
Wednesday, September 23
Well, well, well, well, well, well, well, well, well, well, well, well, well, well, well. We're back. Sorry. We've been watching the onslaught of vulnerabilities flood the internet. Every man, dog, and their grandmas (apparently?) are now using LLMs to find and reproduce vulnerabilities - it’s a free-for-all (unless you’re trying to buy RAM). Unfortunately, while we're all finding more vulnerabilities and flexing obfuscated stack traces… (or emoji-ridden HTTP requests that are actually complete slop and not real, and please, for the love of god, no, those slop-ridden payloads appearing in your access_log are not proof of exploitation jesus wept, it’s becoming traumatic) …on many social media networks, some things have remained reassuringly steadfast: the vendors and their struggle to seemingly care about the security of your network. Yes, that’s right - it’s time for more Secure by Design jokes. Welcome back to another watchTowr Labs blog post. We’ve missed you (admit you’ve missed us, please).
A short write-up of some research I did recently.
https://www.justice.gov/usao-cdca/pr/tech-ceo-russian-national-arrested-complaint-alleging-they-hid-russian-ownership-and CEO is facing 20 years in prison.
Security testing and exposure management have run on separate tracks for years, leaving a blind spot between what a scanner flags and what an attacker can exploit. Synack's new integration with Wiz closes that disconnect, feeding continuously validated pentest findings directly into Wiz's exposure management view. The post Unifying Security Testing and Exposure Management: Introducing the Synack and Wiz Integration appeared first on Synack .
Overview Imprivata Enterprise Access Management (EAM), an authentication and single sign-on platform for enterprise and clinical environments, contains a vulnerability in versions 26.2.6 and below. The product provides no supported mechanism to rotate its RSA key pair after deployment, meaning the same key pair is used indefinitely to generate the appliance's X.509 certificate. Description CVE-2026-82356 Imprivata EAM uses an RSA key pair to generate the X.509 certificate that identifies the appliance to the clinical workstations, Electronic Health Record (EHR) platforms, and shared-device workflows that rely on it for authentication. After reviewing the product documentation and engaging Imprivata support, it was confirmed that no supported mechanism exists to rotate this RSA key pair after deployment. Using a single RSA key pair indefinitely for certificate generation violates cryptographic best practices. Because the key cannot be rotated, an attacker who obtains the private key retains a valid, trusted appliance identity for as long as the deployment remains in service, with no supported means to revoke or replace it short of redeploying the product. Impact An attacker who obtains the private key, for example through backup exfiltration, a hypervisor snapshot, or privileged access to the appliance filesystem, can impersonate the appliance to any endpoint that trusts its certificate. Because Imprivata EAM sits directly in the authentication path, this allows persistent, difficult-to-detect interception of authentication traffic across every application the appliance brokers, including SSO tokens, session assertions, and credentials for EHR and clinical systems. If perfect forward secrecy is not enforced, previously captured traffic can also be decrypted
Cybersecurity researchers have disclosed Go-based malware distributed via two Go Modules and two Terraform providers, marking the first time threat actors are using the centralized repository hosted by HashiCorp as a distribution vector for malicious payloads. According to Aikido, the list of Terraform providers and Go modules is below - gocommunity-io/dockerd (222 downloads) kreuzwenker/
The private email address GitLab gives you for filing issues by email is a credential. Anyone who gets it can email a patch that GitLab commits in your name, to any branch you can push to, including main, and can start CI/CD jobs that run as you. GitLab shows each user this address behind a button labeled "Email work item to this project." Mail sent to it opens an issue in that project, authored
Most penetration testing RFPs ask vendors to price "one web application" or "an annual pentest" and leave the rest open to interpretation. This guide gives you a complete penetration testing scope-of-work template, a standard vendor response format, a weighted scorecard, and a pass/fail checklist, so every proposal answers the same questions and gets measured against the same bar. The post Penetration Testing RFP: What to Include and How to Evaluate Responses appeared first on Synack .
Two MikroTik RouterOS SSH vulnerabilities chained together let attackers take full administrative control of Internet-exposed routers without a password, SSH key, or completed authentication. The chain, which CERT Polska calls MikroTrick, combines an SSH state-machine flaw (CVE-2026-67279) with an argument-injection bug in the RouterOS login process (CVE-2026-86060). Attack logs date to at
A Windows malware called CLOSEDQUORUM is built to take orders from a vote of up to four AI models instead of an attacker's server, Cisco Talos said on September 22. The models can choose to steal Windows credentials, saved browser passwords, and crypto wallet data. Talos has not seen this setup work from start to finish, and the public version of the malware does not work as it is.
Unknown threat actors have managed to compromise two legitimate MemTensor packages across the npm and Python Package Index (PyPI) repositories to push a platform-specific Go-based implant dubbed sckit designed for Windows, Linux, and macOS. According to reports from Aikido, SafeDep, Socket, and StepSecurity, the libraries in question below - @memtensor/memos-cloud-openclaw-plugin versions
Meta says it issued a fix for the Muse zero-day vulnerability that would have let attackers do “whatever” they wanted on a victim’s Mac, highlighting the inherent dangers of AI helpers.
Autonomous security agents are getting good at finding bugs. Nobody has a good way to measure how good. Point one at a realistic target and what comes back is a report the agent wrote about itself: confident prose, a list of findings, and no way to tell which of them happened. Someone with a security background then sits down and checks every claim against the target. Which findings are real,
Presently sponsored by: SACR's Endpoint Control and Prevention report, live Oct 1 with its author and Origin's founder, deep on endpoint AI observability. Register. Heads up: the first 7 mins is a bit quiet until we worked out the external mic was misbehaving - sorry! But get through that and have a listen to Scott's experiences with how Report URI is identifying malware-infected machines within orgs, all due to CSP reporting. It's a super cool use of the technology, and I'm sure there's an awesome potential for it that neither of us has really thought about yet. Plus, the crazy rate of malicious browser extensions he's picking up with help from "Rory", his local OpenClaw instance.
Tuesday, September 22
Overview Vendor-signed UEFI Shell applications may allow an attacker to bypass Secure Boot protections by abusing commands such as mm (Memory Modify). On systems that trust the affected vendor’s certificate or include the application’s Authenticode hash in the UEFI Authorized Signature Database (DB), an attacker with sufficient access could use the application’s direct memory-access capabilities to disable or circumvent Secure Boot enforcement and execute untrusted UEFI code. To mitigate this risk, system administrators should apply available firmware and software updates from affected hardware vendors. Description The Unified Extensible Firmware Interface ( UEFI ) standard defines the firmware architecture used to initialize hardware and transfer control to modern operating systems during system startup. On systems with Secure Boot enabled, UEFI applications and drivers must be cryptographically signed and verified before their execution. Trust for these signatures is managed through several databases, including the Authorized Signature Database (DB), which commonly contains certificates from original equipment manufacturer (OEM) vendors, operating system authorities, and other supply-chain partners in the UEFI ecosystem. There are multiple implementations of the UEFI Shell, and OEM vendors typically sign the implementation that they distribute. Some UEFI Shell implementations expose built-in capabilities for directly manipulating system memory and interacting with the UEFI environment. Because the Shell is vendor-signed and therefore permitted to execute with Secure Boot enabled, an attacker who can launch a vulnerable Shell can use these capabilities to modify the protected pre-boot state and potentially load or execute untrusted UEFI code. This creates a security boundary violation: Secure Boot permit
The response header, Vary , has been called “ the ugliest part of HTTP that we haven't yet improved. ” The same post describes it as a “horrible, kludgy mechanism” with “pretty abysmal interoperability” across intermediaries. That is usually where sensible engineers back away slowly with their hands raised. That’s not exactly an endorsement of Vary , but ugly doesn’t mean useless. One URL can have more than one correct response. A server might, for example, deliver different image formats to different browsers. If a cache ignores Vary , it risks serving the wrong bytes to a request. But if it treats every raw header value as distinct, a handful of similar requests can spread into thousands of barely reusable cache entries. Vary tells a cache which request fields may affect the response, but it does not tell the cache which differences actually matter. Vary support is now available in Cache Rules on every plan. The origin still names the request headers that may affect a response, but you decide how Cloudflare handles each one. You can normalize known negotiation headers, pass exact values through when those small differences matter, or bypass cache when the variation is too unpredictable. The origin declares what may vary, and you decide how much variation is actually meaningful for the cache. How Vary works Vary is a standard HTTP response header that tells intermediary caches (like Cloudflare) which request fields may affect the response sent by the origin. Sites use Vary to serve d
Nothing is worse than testing out a change that works in staging, only to see it behave differently in production. That’s why we wanted to give you an environment that’s as close to production as possible — so you can battle-test your changes and make sure they behave exactly as you expect them to. Agents are helping us push more lines of code than ever before, and larger changes mean more ground needs to be tested ahead of release. Ideally, that testing is done in a way that doesn’t slow agents down , but gives them the tools to take on more of the development lifecycle. That’s why today we’re launching Worker Previews . Each Git branch gets a production-like place to run, with its own code, configuration, URL, observability, and state. So now, for every change in your codebase, you can: Deploy an isolated Preview with npx wrangler preview , using its own variables, secrets, and bindings, separate from production configuration and traffic. Share a stable Preview URL for the branch so that every push updates the same running Preview where you can send requests, click through the UI, and test runtime responses. Isolate Durable Objects and Containers per branch, keeping state changes, sessions, memory, migrations, and concurrent tests scoped to that Preview. Inspect logs, errors, metrics, and traces for that Preview to confirm the change works, catch failures, push a fix, and verify it before production sees it. Start from the Preview configuration you set, so each Preview begins with a copy of the variables, secrets, bindings, and settings you define — just like a code branch starts from main . We call
Cisco Talos researchers created a new framework for identifying malware and hacking tools that rely on AI chatbots—and quickly discovered something unusual.
I reverse-engineered Intel's NPU stack and got custom C kernels running on its programmable SHAVE cores
Your conversations with AI chatbots are both highly personal and deeply vulnerable to surveillance. Here’s how you can protect yourself.
CVE-2026-59309 & CVE-2026-59310: patch-diffing VMware vCenter reveals two pre-auth 9.8 bugs - an auth bypass and a syslog path traversal to RCE
Two things happened last week, one day apart, and almost nobody connected them. On 11 September, the EU Cyber Resilience Act’s vulnerability reporting obligations came into force. Companies covered by the regulation now have to report actively exploited vulnerabilities within 24 hours and provide a fuller notification within 72. On 12 September, Anthropic CEO Dario […] The post Slow is a design principle, not a delay appeared first on Heimdal Security Blog .
Monday, September 21
We introduced Python Workers two years ago, providing a way to run Python applications in the Cloudflare Workers runtime. Our goal was to make it as simple to write Workers in Python as it is in TypeScript, and to make the ecosystem of Python packages and frameworks “just work”. Today, Python Workers are now generally available (GA). What does GA mean? It means Python is now a first-class, fully supported language on the Cloudflare Developer Platform. You can bring the Python code, libraries, and design patterns you already know and connect them seamlessly to Workers AI, R2, D1, Hyperdrive, Durable Objects, Queues, Workflows, and the rest of the Cloudflare platform. You can also run popular Python frameworks like FastAPI, Django, and Flask inside Python Workers. You can even create a Python Worker inside another Worker using Dynamic Workers . The journey behind Python Workers Bringing Python to Cloudflare Workers was a natural choice. Because Workers has supported WebAssembly since 2018 , it gave us the perfect environment to run a Wasm-compiled Python interpreter. By using Pyodide , we were able to quickly support a wide range of Python applications in Cloudflare Workers. Our goal was to create the first platform for infinitely scalable Python apps, while making it as easy and performant as developing Python apps anywhere else. The features we are highlighting today are the result of this multi-year effort. Many developers are already building applications within Python Workers
Born out of academia and raised in corporate IT departments, the Security Assertion Markup Language (SAML) authentication protocol continues to be a staple in these organizations. However, it’s time for it to retire. With the rise of software-as-a-service (SaaS) companies in the late aughts, IT departments needed a way for users to authenticate to many new web services. SAML and the burgeoning single sign-on (SSO) industry fulfilled this need. However, SAML is being crushed under the weight of its own complexity. It’s time to deprecate it and move on to modern alternatives like OpenID Connect (OIDC). In this post, I will explore the design-by-committee origin of SAML, its progression through the ranks in academic and corporate environments, its slow disintegration at the hands of the security research community, and its (hopeful) deprecation in favor of newer protocols. SAML 101 What’s insidious about SAML is that it really is mostly straightforward to understand, but it’s built on a foundation of sand, bone dust, and ash; it works … if you assume XML signature validation is reliable. But XML signature validation is deeply cursed, and is so complicated that most fielded SAML implementations are wrapping libxmlsec, a gnarly C codebase nobody reads. — Thomas Ptacek, 2023 SAML and the birth of the SSO industry Wikipedia tells me that “SAML is an
Officials discussed setting up a mechanism for the two countries to notify each other of AI incidents which could threaten national security.
This short blog post is about abusing a privilege escalation bug that Microsoft recently fixed in Windows, CVE-2026-66804, that I and 14 others reported. This issue is an incomplete fix for CVE-2026-50343, a bug dubbed “Dark Elevator” by Calif. The root cause of the bug was a dangling COM object registration for the CrossDevice COM object with the CLSID {E9F83CF2-E0C0-4CA7-AF01-E90C70BEF496}. A COM registration typically needs two parts: a server executable, which for in-process components is a DLL and a CLSID entry under the HKEY_CLASSES_ROOT registry key which points to that DLL.
Open Season on Kapibala: Attacker Steals Over 18,000 Government Records Through WordPress Exploitation
GreyNoise has been tracking malicious use of an IP address since early June 2026 due to its frequent use in scans and attacks against a variety of technologies. We detail a few of the more notable intrusions we observed including the theft of more than 18,000 sensitive records from a western government.
Saturday, September 19
AI labs are toying with an industry-wide pact to slow development. Meanwhile, widely available AI chatbots are already helping uncover a tidal wave of security flaws.
Every VPN says it’s the best, but only some of them are telling the truth.
As dozens of cities end contracts for its controversial license plate readers, Flock is rolling out a voluntary severance program, WIRED has learned.
Friday, September 18
Cloudflare operates at a scale so big that even after working here for years, it doesn’t seem real. We have thousands of servers all over the world with petabytes of RAM and millions of CPU cores, and all of it is pushed to the max. As vast as those resources feel, they are still finite, and when you need every service to run on every node, it doesn’t leave room for wasted space. At this scale, small improvements are greatly magnified, so even 1%-at-a-time improvements are worth celebrating. And some tweaks add up to a lot more: in this post, we’ll look at how small changes to a single algorithm reduced the memory footprint of one of our Pingora-based services significantly. That allowed us to reclaim more than 100TB of RAM globally, on top of the 100TB of memory the DNS team was able to shed last month . Waste not Maintaining equitable resource sharing between teams is not easy, especially in large organizations. One of the ways Cloudflare ensures the balance is kept is through the tireless efforts of the wonderful Performance team. This story starts with a ticket filed by Ivan who found: Excessive memory usage from pingora-ketama in Pingora Backend Router . The finding was that our internal load-balancing service, Pingora Backend Router (yes, PBR), was using significantly more memory than expected — specifically in structures associated with pingora-ketama, which is our open-source library for handling consistent hashing. In order to talk about ho
Exclusive: Official UK security assessment found Microsoft cloud platform storing files was at potential risk from hostile hackers Vast troves of highly sensitive police data are lying on Microsoft cloud platforms which an official UK security assessment deemed to be vulnerable to “compromise” by foreign actors and the US government, a Guardian investigation can reveal. The files include criminal records, victim statements, internal emails and sensitive information held by more than 40 police forces across the UK. Continue reading...
TeamPCP pulled off the worst-ever software supply-chain hacking spree and breached thousands of companies. Now Google’s threat intelligence group says it had a mole inside the hackers’ inner circle.
After three months of daily anti-government protests—dubbed the Flamingo Revolution—the sudden mass suspension of Instagram accounts has led to fears of brigading against demonstrators.
US cybersecurity researchers who conducted hack say ‘scope of what we could theoretically access was huge’ Cybersecurity researchers have hacked into OpenAI with the help of Anthropic’s Claude chatbot, in the latest example of security issues at the company. A team at a US-based startup compromised a number of OpenAI employees’ ChatGPT accounts, starting a process that enabled them to access their target’s software cache – and potentially more. Continue reading...
Security firms have published numerous blog posts describing how they pointed their agent harness at a codebase and found dozens of bugs ( we’re one of them ). However, these posts tend to focus on agentic code review, which is just one aspect of how we use AI in our security reviews. We want to give a different perspective: before code review even starts, agents now allow us to build custom tooling and formal models that improve the quality and depth of our reviews. We recently reviewed the Miden VM, a new zero-knowledge VM with its own custom assembly language and almost no developer tooling. To prepare, we spent six months having our agents build an LSP server , a decompiler , a static analysis engine , and a Lean model of the VM executor from scratch. These tools found real security issues, like an unvalidated prover-supplied input that would let a malicious prover forge Falcon signatures and steal funds from Miden account holders. Additionally, the Lean work produced 95 machine-checked correctness proofs, covering a large component of the Miden core library. Auditing the Miden zkVM In late 2025, the Miden team came to us to have parts of their zero-knowledge VM reviewed before launch. Part of the review was scoped to cover the Miden core library, which contains a small set of cryptographic primitives written in a custom assembly language called Miden as