A researcher disclosed an unpatched flaw in internet-connected Shark robot vacuums that lets an attacker take control of other owners' units across the same cloud region. The certificate a vacuum uses to authenticate to its maker's Amazon cloud broker was never restricted to that one device, so a certificate pulled from a vacuum's flash memory can send root commands to any Shark vacuum the broker serves. That means watching the camera, driving the robot, reading the stored map of a home, and taking the Wi-Fi password in plaintext. No memory corruption or password guessing is needed. The researcher says the maker has had the report since March with no fix.
Security firm Mindgard disclosed an unpatched flaw in Cursor, the widely used AI code editor, that runs code automatically when a developer opens a malicious repository on Windows. When loading a project, Cursor looks for a Git binary in several places, including the workspace itself, so a file named git.exe planted in the repository root gets executed with no click, prompt, or warning, and it re-runs on a cadence while the project stays open. In a proof of concept, a renamed Windows Calculator launched on its own. Mindgard reported it in December and went public after seven months with no fix, so there is no patch and no CVE, only workarounds.
A researcher who calls themselves Chaotic Eclipse - and who has weaponized every prior Windows flaw they have leaked this year - dropped working proof-of-concept code for two unpatched zero-days on May 12. YellowKey lets anyone with physical access to a Windows 11 or Server 2022/2025 machine plug in a USB stick, hold CTRL during a reboot into the Windows Recovery Environment, and get a shell with full access to the BitLocker-protected drive. GreenPlasma is a privilege escalation against the CTFMON service that hands an unprivileged user a path to SYSTEM. Independent researchers including Will Dormann and Kevin Beaumont have confirmed that YellowKey works as advertised.
Researcher Hyunwoo Kim disclosed Dirty Frag yesterday after an unrelated third party broke the embargo five days early. The flaw chains two Linux kernel page-cache write bugs (xfrm-ESP and RxRPC) to give any local user root access on every major distribution - Ubuntu, RHEL, CentOS Stream, AlmaLinux, openSUSE Tumbleweed, Fedora. Like Dirty Pipe and last week's Copy Fail, it's a deterministic logic bug with no race condition required and no kernel panic on failure. PoC is public on GitHub. The ESP variant patch was merged into the netdev tree on May 7 but distribution kernels remain unpatched. No CVE assigned yet because the embargo broke early.
Palo Alto Networks confirmed Wednesday that attackers are exploiting a zero-day in its firewall login portal to run code as root on PA-Series and VM-Series firewalls. CVE-2026-0300 (CVSS 9.3) is a buffer overflow in the User-ID Authentication Portal (Captive Portal) that lets unauthenticated attackers send crafted packets and execute code without any login. Palo Alto Unit 42 attributed the activity to CL-STA-1132, a likely state-sponsored cluster that started probing on April 9 and achieved RCE a week later. Attackers deploy tunneling tools and enumerate Active Directory using the firewall's service account. First patches arrive May 13. Shadowserver counts 5,800+ exposed VM-Series firewalls.
Researchers disclosed a critical unauthenticated remote code execution flaw in Hugging Face's LeRobot, the open-source framework used to train and deploy ML models on physical robots. CVE-2026-25874 sits in the framework's web interface, which by default listens on all network interfaces with no authentication - quick for demos, but a hard fail when the demo box ends up on a corporate network. There is no patch yet. Hugging Face has been notified but hasn't released a fix. Particularly serious because LeRobot is usually attached to actual robotic hardware, so a compromise can mean unsafe physical actions.
Update on the Windows Defender zero-day situation: Huntress now confirms attackers are chaining the three flaws leaked April 3 by a researcher called 'Chaotic Eclipse' to deploy a custom tunneling agent named 'BeigeBurrow' on victim systems. Microsoft patched one of the three (BlueHammer, CVE-2026-33825) on April 14, but the other two are still unpatched two weeks later: RedSun lets attackers gain SYSTEM privileges even on patched machines, and UnDefend stops Defender from receiving signature updates - effectively turning off the antivirus. CISA gave federal agencies until May 6 to deploy the BlueHammer patch.
Kaspersky disclosed PhantomRPC at Black Hat Asia on April 24, an architectural flaw in how Windows handles a core internal communication system called RPC (Remote Procedure Call). When a privileged Windows process tries to talk to an RPC server that isn't running, the operating system doesn't check whether the thing answering is the real one - so a low-privileged attacker can stand up a fake RPC server, intercept the call, and inherit SYSTEM-level access. All Windows versions are affected. Kaspersky demonstrated five different exploitation paths and published the research tools on GitHub. Microsoft has not released a patch.
A critical sandbox-escape flaw in Cohere AI's open-source Terrarium project lets code running inside the sandbox break out and execute arbitrary commands as root on the host Node.js process. Terrarium is a Python sandbox built on Pyodide (a browser- and Node.js-compatible Python distribution running in WebAssembly) and deployed as a Docker container to safely run untrusted code submitted by users or generated by a large language model. That exact use case makes the blast radius real: any AI product using Terrarium to evaluate LLM-generated Python code is giving its models a direct path to root on the container and, from there, potentially on the host. The flaw (CVE-2026-5752, CVSS 9.3) stems from JavaScript prototype chain traversal in the Pyodide WebAssembly environment: sandboxed code can reach parent and global object prototypes to manipulate objects in the host, a technique SentinelOne describes as prototype pollution bypassing the intended security boundaries. Exploitation needs local access to the sandbox but no special privileges or user interaction. The project has been starred 312 times and forked 56 times. Because Cohere is no longer actively maintaining Terrarium, the flaw is unlikely to ever be patched. Security researcher Jeremy Brown reported the issue.
Just days after Microsoft patched BlueHammer (CVE-2026-33825) in Tuesday's Patch Tuesday, the same researcher 'Chaotic Eclipse' (aka Nightmare-Eclipse) has released a second Microsoft Defender local privilege escalation zero-day called RedSun. The exploit works on fully-patched Windows 10, Windows 11, and Windows Server systems with Windows Defender enabled, even after installing this week's April updates. The flaw abuses Defender's cloud file rollback behavior: when Defender detects a file with a 'cloud tag' it tries to restore it to its original location without validating the target path. The exploit uses NTFS junctions and opportunistic locks to redirect the write to C:\Windows\System32, overwriting system files like TieringEngineService.exe to gain SYSTEM privileges. Huntress Labs is reporting all three recently-leaked Windows Defender zero-days (BlueHammer, RedSun, and UnDefend) are now being exploited in the wild. The researcher has threatened to drop more severe RCE exploits in protest of how Microsoft handled their disclosure process. No patch available for RedSun yet. Working PoC code is public on GitHub.
TrustStrike Labs