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Urgent Windows 11 Update: Vulnerabilities Exploited

Urgent Windows 11 Update: Vulnerabilities Exploited

First seen 20 Oct 2026, 10:48 UTC • •
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ThreatCluster AI
ThreatCluster •October 20, 2026 at 12:20 UTC
  • •Microsoft released a critical update for Windows 11 addressing 1,413 vulnerabilities.
  • •CVE-2026-96951 is a zero-day vulnerability actively exploited in the wild.
  • •Users must restart their PCs after applying the update to ensure security.

Microsoft has issued a Patch Tuesday update for Windows 11, addressing 1,413 vulnerabilities. Among these, CVE-2026-96951 is a zero-day vulnerability in the wild, allowing attackers to bypass the Mark of the Web defense. This vulnerability can be exploited through specially crafted files sent via email. Another significant flaw, CVE-2026-108398, affects the.NET Framework and could allow unauthorized applications to run by bypassing Windows Defender Application Control. Users are advised to restart their PCs immediately after applying the update to ensure protection. The update is crucial for maintaining system security against potential attacks.

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Timeline

2026-10-13
CVE-2026-96951 published
Microsoft disclosed a zero-day vulnerability allowing bypass of Mark of the Web defenses.
Express
2026-10-13
CVE-2026-108398 published
A high-severity vulnerability affecting the .NET Framework was disclosed, allowing unauthorized app execution.
Express
2026-10-20
Patch released
Microsoft released a major update for Windows 11 addressing 1,413 vulnerabilities, urging immediate user action.
Express

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Common questions

Which versions of Windows are affected?
All versions of Windows 11 are affected by the vulnerabilities addressed in the update.
How urgent is the update?
The update is critical due to the active exploitation of CVE-2026-96951, requiring immediate action.
What steps should users take?
Users should restart their PCs after applying the update to ensure all vulnerabilities are patched.