Morning Brief

Serial Microsoft zero-day leaker NightmareEclipse has found another way to mess with Windows Defender, this time by stopping the antivirus from updating itself. The security researcher, also known as Abdelhamid Naceri, released a proof-of-concept dubbed “BigDiskBuster” that is designed to prevent Microsoft Defender Antivirus from installing platform and security intelligence updates. “Made a funny tool, completely denies defender from updating so you're stuck with your current version if the tool is running in the background,” NightmareEclipse said. The researcher describes BigDiskBuster as…

Cisco Talos has released CAIRN, an open-source toolkit designed to hunt, classify, and track AI-integrated malware by examining the digital markers developers leave behind. The Cognitive Artifact Intelligence Research Network searches for prompt templates, provider endpoints, API-key prefixes, jailbreak terms, and orchestration logic without downloading or executing binaries. The launch also revealed CLOSEDQUORUM, which Talos describes as the first publicly documented Windows implant to delegate tactical command-and-control decisions to artificial intelligence. Instead of awaiting…

Security teams have spent decades asking whether an identity has too much access. AI agents raise a harder question: how can we determine which paths an autonomous system can discover, given the access it already has? A person may try several ways to complete a task. A deterministic application follows the flow its developer wrote. But an AI agent is relentless in its pursuit of done. In May

A newly disclosed Linux kernel vulnerability, tracked as CVE-2026-89775, could let attackers escape an ARM64 virtual machine and access the underlying host system. The issue affects KVM/arm64 environments where nested virtualization is enabled, creating a serious risk for multi-tenant cloud infrastructure and systems that allow untrusted users to create virtual machines. Security researcher Hyunwoo Kim reported that the flaw stems from a type truncation issue in the KVM/arm64 stage-1 page-table walk process. The bug affects how the kernel calculates the size of a memory region it must…

A new flaw in WordPress core let an anonymous visitor leave a comment that planted a hidden script on the page. If a logged-in administrator later opened that page, the script could run code on the site's server. WordPress fixed the flaw, tracked as CVE-2026-93485 and called "Comment2Shell," on September 17 in version 7.1.1 and told site owners to update right away. There is

TASK#STOMP is a newly analyzed Windows backdoor that turns ordinary built-in tools into a durable spying operation. It uses a Visual Basic Script installer, hidden PowerShell, scheduled tasks, and runtime code compilation to collect business documents, saved Wi-Fi passwords, clipboard data, and screenshots from compromised machines. The observed infection begins with a randomly named VBS file in a user-accessible location. Its delivery route remains unconfirmed: the available evidence cannot distinguish phishing, a browser download, removable media, remote access, or an extracted archive…

Hackers are using convincing copies of trusted websites to turn an ordinary browser visit into a full Windows compromise. The campaign pairs targeted phishing emails with a chained set of previously unknown flaws in Google Chrome and Microsoft Windows, giving attackers a quiet path from a fake page to malware on a victim’s device. The activity was recorded on September 3 and 4, before the affected flaws were patched. It targeted Asian government entities with a Chinese-language message about jailed Hong Kong activist Chow Hang-tung, while another lure impersonated the Center for American…

View CSAF Summary Industrial Edge Management contains an authentication bypass vulnerability that could allow an unauthenticated remote attacker to perform full account takeover by resetting user credentials without completing email verification. Siemens has released new versions for the affected products and recommends to update to the latest versions. The following versions of Siemens Industrial Edge Management are affected: Industrial Edge Management Cloud vers:all/* (CVE-2026-18963) Industrial Edge Management Pro V1 vers:intdot/>=1.14.9|<1.15.20 (CVE-2026-18963) Industrial Edge Management…