CVE-2026-20805
Published 2026-01-13 · Updated 2026-07-30 · Source secure@microsoft.com
Summary
CVE-2026-20805 is a medium-severity (CVSS 5.5) vulnerability in Microsoft Windows. CISA added it to the Known Exploited Vulnerabilities catalog on January 13, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by February 3, 2026. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.
All 390 known-exploited Microsoft vulnerabilities →Description
Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CISA Known-Exploited Vulnerability
Product: Microsoft — Windows
Name: Microsoft Windows Information Disclosure Vulnerability
Date added: 2026-01-13 · Due: 2026-02-03
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.