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A high-severity security flaw in Langflow, an open-source low-code platform to build artificial intelligence (AI) applications, has come under active exploitation in the wild, according to findings from VulnCheck. The vulnerability in question is CVE-2026-5027 (CVSS score: 8.8), a case of path traversal that could allow an attacker to write files to arbitrary locations. "The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../')," Tenable, which discovered the flaw, said in an alert released in late March 2026. The cybersecurity company said it attempted to contact the project maintainers three times in January and February 2026, before disclosing details of the issue on March 27. Caitlin Condon, vice president of security research at VulnCheck, said in a LinkedIn post that the v...

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added three new vulnerabilities to its Known Exploited Vulnerabilities ( KEV ) catalog, following reports of active exploitation. The list of vulnerabilities is as follows - CVE-2026-20245 (CVSS score: 7.8) - An improper encoding or escaping of output vulnerability in Cisco Catalyst SD-WAN Manager that could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. CVE-2026-11645 (CVSS score: 8.8) - An out-of-bounds read and write vulnerability in Google Chrome V8 that could allow a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. CVE-2026-7473 (CVSS score: 6.9) - An incomplete comparison with missing factors vulnerability in Arista Extensible Operating System (EOS) that could be exploited to process non-configured tunnel traffic. No Patch Planned for Exploited Arista EOS Flaw "On...

Your pentest report looks clean. That might be the problem. Run automated pentesting long enough, and the new findings start to dry up. By the third or fourth run, fewer issues appear. The report looks stable. Leadership reads "stable" as "secure." It usually isn't. The work slows down. The risk does not. That gap is what a The Hacker News webinar with Picus Security sets out to close. Autumn Stambaugh and Can Yüceel, with host James Azar, show what your tool validates, where it stops, and how to close what it leaves open. Register for the webinar. Start with the core problem. A flat report can mean the obvious holes were fixed. It can also mean the tool has reached the edge of what it can see. Automated pentesting is often treated as full security validation. It is not. Picus frames validation as six surfaces and puts automated pentesting on one of them, the attack path: whether an attacker can move through an environment. That leaves the other five ...

Microsoft on Tuesday released fixes for a record 206 security vulnerabilities impacting its software portfolio, including three flaws that have been publicly disclosed at the time of release. Of the 206 flaws, 39 are rated Critical, and 167 are rated Important in severity. This includes 63 privilege escalation, 56 remote code execution, 30 information disclosure, 27 spoofing, 20 security feature bypass, seven denial-of-service, and three tampering vulnerabilities. The patches also include two non-Microsoft CVEs, a privilege escalation vulnerability impacting Windows Kernel ( CVE-2025-10263 ) and a UEFI Secure Boot security feature bypass ( CVE-2026-8863 ). They are in addition to more than 350 security flaws that Google has addressed in Chromium, which is used in Microsoft's Edge browser. Topping the list of fixes is CVE-2026-45657 (CVSS score: 9.8), a use-after-free flaw affecting Windows Kernel that could result in remote code execution. "An attacker could exploi...

On June 9, Anthropic released Claude Fable 5 , the most capable model it has ever made, generally available. It also did something unusual: it shipped one model as two products, split not by capability but by a layer of safety classifiers. Fable 5 goes to the public. Its twin, Claude Mythos 5, the same underlying model with the cyber safeguards lifted, stays locked to a vetted group of cyber defenders and critical infrastructure operators. Anthropic calls Mythos 5 the strongest cybersecurity model in the world. The practical difference is this: Fable 5 routes flagged cyber, biology, chemistry, and distillation requests to the weaker Claude Opus 4.8, while Mythos 5 keeps the cyber capabilities available for vetted users. Both models cost $10 per million input tokens and $50 per million output tokens, less than half the price of the earlier Mythos Preview, and Fable 5 is available through the Claude API now. It is included on Pro, Max, Team, and seat-based Enterprise plans at no...

ServiceNow has warned about a security incident in which unknown threat actors exploited a flaw to obtain deeper unauthorized access to susceptible instances. "On June 5, 2026, ServiceNow applied a security update to hosted customer instances," the company revealed in an advisory that requires customer access. "The update concerned a security issue that could allow an unauthenticated user, in certain circumstances, to gain greater access to ServiceNow instances than intended." The security update makes changes to an endpoint configuration to limit this access to authenticated users. The security flaw currently does not have a CVE identifier. Details of the issue first emerged on Reddit. ServiceNow said it detected anomalous activity relating to the security issue, and that it observed evidence of successful queries of instance tables against a "subset of customers." Impacted customers have been notified, it added. "The security issue pertai...

The anonymous security researcher going by the name Chaotic Eclipse (aka Nightmare-Eclipse) has released a proof-of-concept (PoC) exploit for yet another Microsoft Defender zero-day named RoguePlanet . "The exploit is a race condition, so it's a hit or miss," the researcher, who published the exploit under a new GitHub account "MSNightmare" said . "I have managed to get a 100% success rate on some machines while it struggled to work on others." Should the exploit succeed, the result is a shell with SYSTEM-level privileges, granting the attacker the ability to run arbitrary code or perform unauthorized actions. The researcher said the exploit has been tested on Windows 11 and 10 machines with the June 2026 Patch Tuesday updates installed, meaning the exploit works on the up-to-date versions of the desktop operating system. That said, the exploit does not work on Windows Server instances in its current form since "standard users cannot mou...