CVE-2026-20805

Microsoft Windows Information Disclosure

Added to CISA KEV: 2026-01-20

By FixTheVuln Team Sources: CISA KEV Catalog, NVD
CVSS 10 — CRITICAL ZERO-DAY ACTIVE
OWASP: A01 CWE-200

Description

Memory leak in Desktop Window Manager allowing exploit mitigation bypass.

Required Action

Fix: Apply January 2026 Cumulative Update (Deadline: Feb 3).

References

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Use the CVSS Calculator to evaluate how this vulnerability affects your specific environment. Consider your network exposure, existing mitigations, and asset criticality.

Frequently Asked Questions

What is CVE-2026-20805?

CVE-2026-20805 (Microsoft Windows Information Disclosure) is a vulnerability with a CVSS score of 10 (CRITICAL). This is an actively exploited zero-day vulnerability. Memory leak in Desktop Window Manager allowing exploit mitigation bypass.

How do I fix CVE-2026-20805?

Apply January 2026 Cumulative Update (Deadline: Feb 3).

How severe is CVE-2026-20805?

CVE-2026-20805 has a CVSS score of 10, classified as CRITICAL. This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been actively exploited in the wild.

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