[ CVE-2026-21533 · Published 10 Feb 2026 ]
Microsoft Windows Improper Privilege Management Vulnerability
Exploited · CISA KEV CVSS 7.8
EPSS 4%No fix listed yet
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-02-10
[ Description ]Official description
Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.
CISA: Microsoft Windows Remote Desktop Services contains an improper privilege management vulnerability that could allow an authorized attacker to elevate privileges locally.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 3 Mar 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533Vendor Advisory
- www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vul…Third Party Advisory
- www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vu…MitigationThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource