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CVE-2026-20805: Microsoft Windows Information Disclosure Vulnerability

criticalknown exploitedpublic exploitCVE-2026-20805
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows Desktop Windows Manager contains an information disclosure vulnerability that allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: WindowsInformation disclosure
What
The vulnerability allows an authorized attacker to disclose information locally through the Desktop Windows Manager.
Who is affected
Authorized users of Microsoft Windows are affected.
Urgency
Remediation is urgent as the vulnerability is actively exploited and critical.
Action
Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-01-13
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-20805

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-20805coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows Information

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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