Microsoft’s January 2026 Patch Tuesday fixes 114 Windows flaws, including an actively exploited Desktop Window Manager bug added to CISA’s KEV list.

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Microsoft's January 2026 Patch Tuesday addresses 114 security vulnerabilities across Windows and related products. One critical flaw (CVE-2026-20805) in Desktop Window Manager is actively exploited in the wild, allowing unauthorized information disclosure that can defeat ASLR protections. CISA has added it to the KEV catalog with a February 3 deadline for federal agencies. Other notable fixes include a Secure Boot certificate expiration bypass, VBS Enclave privilege escalation, and removal of vulnerable Agere modem drivers. The update includes 8 critical and 106 important severity flaws, covering privilege escalation, information disclosure, and remote code execution vulnerabilities.

Microsoft Fixes 114 Windows Flaws in January 2026 Patch, One Actively Exploited