Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

Microsoft August 2026 Patch Tuesday Fixes 400 Flaws, Including Three Zero-days

Microsoft’s August 2026 Patch Tuesday release addresses roughly 400 security flaws across its products, including three Zero-days. One of the three is being actively exploited, while the other two were publicly disclosed before Microsoft issued fixes. The August 2026 Patch Tuesday update includes 42 vulnerabilities rated “Critical.” Of those, 37 involve remote code execution, and five involve elevation of privilege. The vulnerability breakdown is approximately 176 elevation-of-privilege flaws, 11 security-feature bypasses, 110 remote-code-execution flaws, 86 information-disclosure issues, 12 d

ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access

The security researcher going by the name Chaotic Eclipse (aka INFINITE NIGHTMARE, MSNightmare, and Nightmare-Eclipse) has released a proof-of-concept (PoC) for a new Microsoft zero-day called ShieldBreak. The vulnerability, rooted in Microsoft Defender for Windows, demonstrates a patch bypass for CVE-2026-50656 (CVSS score: 7.8), otherwise known as RoguePlanet. RoguePlanet has been described

Microsoft Patch Tuesday August 2026

Microsoft’s August 2026 Patch Tuesday is another substantial security release, addressing 421 vulnerabilities across Windows, Office, Azure, Exchange Server, SharePoint Server, developer tooling and other Microsoft products. More importantly, the…

Microsoft Plugs Nearly 400 Security Holes

Microsoft today released updates to remedy at least 398 security vulnerabilities in its Windows operating systems and supported software, including one weakness that is already being actively exploited and two others that were publicly detailed prior to today.

Patch Tuesday - August 2026

Microsoft is publishing 421 vulnerabilities on August 2026 Patch Tuesday, including 236 vulnerabilities in Windows. This is lower volume than last month’s record-breaking behemoth, but still one of the largest Patch Tuesday totals ever. There is no reason to suppose that Patch Tuesday will ever return to the lower volumes we saw prior to 2026. Microsoft is aware of exploitation in the wild for one of the vulnerabilities published today, as well as public disclosure for two others, although the Notable CVEs section of the Security Update Guide omits one of these. As usual, browser vulns are not

August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEs