Record Microsoft Patch Tuesday, fresh zero-day
Microsoft marked its largest-ever Patch Tuesday this month, by shipping fixes for nearly 200 vulnerabilities. Within hours, “Nightmare Eclipse”, the researcher …
Microsoft changes how Defender for Endpoint EDR updates are delivered on Windows
Microsoft will distribute Defender for Endpoint EDR updates through Microsoft Update, enabling EDR security improvements to be released independently of monthly Windows …
Microsoft’s new cloud PCs place AI agents under enterprise controls
Microsoft’s Windows 365 for Agents, a cloud PC platform for agentic workloads, runs AI agents in secure environments. Organizations can direct agents with natural language to …
Microsoft Defender vulnerabilities exploited in the wild (CVE-2026-41091, CVE-2026-45498)
Attackers are exploiting two Microsoft Defender vulnerabilities (CVE-2026-41091 and CVE-2026-45498), Microsoft acknowledged and CISA confirmed by adding them to its Known …
Microsoft provides mitigation for “YellowKey” BitLocker bypass flaw (CVE-2026-45585)
Microsoft is working on a fix for CVE-2026-45585 (aka “Yellowkey”), a vulnerability that can be used by attackers to bypass protections offered by BitLocker, the …
Microsoft’s WinUI agent plugin trims token use by over 70% during development
Microsoft published a plugin on May 13 that lets GitHub Copilot CLI and Claude Code drive the full WinUI 3 development cycle, from project scaffolding through signed MSIX …
Microsoft’s agentic security system found four critical Windows RCE flaws
Microsoft responded to growing competition in AI security by announcing that its new agentic security system helped researchers discover 16 new vulnerabilities in the Windows …
Microsoft May 2026 Patch Tuesday: Many fixes, but no zero-days
Microsoft has marked May 2026 Patch Tuesday by releasing fixes for 120+ CVE-numbered vulnerabilities, none of which (for a change) are actively exploited or have been publicly …
Rustinel: Open-source endpoint detection for Windows and Linux
Open-source endpoint detection has long been split between Windows-focused tools built around Sysmon and Linux tools built around eBPF or auditd. Defenders running mixed …
Attackers compromised Daemon Tools software to deliver backdoors
Kaspersky researchers uncovered another supply chain compromise involving a popular Windows tool: Daemon Tools, an app for mounting disk image files as virtual drives that is …
Unpatched flaws turn Ollama’s auto-updater into a persistent RCE vector, researchers say
Researchers at Striga have disclosed two vulnerabilities (CVE-2026-42248, CVE-2026-42249) in Ollama’s Windows auto-updater that, when chained together, may allow an …
CISA, Microsoft warn of active exploitation of Windows Shell vulnerability (CVE-2026-32202)
Attackers are exploiting CVE-2026-32202, a zero-click Windows Shell spoofing vulnerability that causes victims’ systems to authenticate the attacker’s server, CISA …
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