Microsoft patches 1,235 security flaws including exploited Outlook zero-day and fixes Exchange sign-in
Microsoft released its November 2026 Patch Tuesday security updates addressing a record 1,235 vulnerabilities in Windows, Office, and other software. Notably, it patches an actively exploited zero-day flaw in Microsoft Outlook used for credential theft. The update also fixes Exchange Server systems' sign-in and mail delivery problems caused by previous October Windows Server updates. Additionally, the U.S. Cybersecurity agency warned of active exploitation of a Cisco BroadWorks vulnerability affecting enterprise communications.
Why it matters
The extensive patch addresses critical security threats actively exploited by hackers, reinforcing protection for millions of enterprise and individual users against data breaches and service disruptions.
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