CVE-2026-21533
Actively exploited. CVE-2026-21533 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-10) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Microsoft Windows Remote Desktop Services contains an improper privilege management vulnerability that could allow an authorized attacker to elevate privileges locally.
CSIRTS triage
- What
- An improper privilege management vulnerability could allow an authorized attacker to elevate privileges locally.
- Who is affected
- Deployments of Microsoft Windows Remote Desktop Services.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update to the latest version as recommended by Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-21533
Get an email if CVE-2026-21533 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 89% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2026-21533: Microsoft Windows Improper Privilege Management Vulnerabilitycisa-kev · 2026-02-10
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-21533)