Microsoft Windows Improper Privilege Management Vulnerability (CVE-2026-21533)
Severity: high · Patch status: unknown · Since 2026-02-10 · CVE-2026-21533
Microsoft Windows Remote Desktop Services contains an improper privilege management vulnerability that could allow an authorized attacker to elevate privileges locally. CISA added CVE-2026-21533 to its Known Exploited Vulnerabilities catalog on Feb 10, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Mar 3, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
