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.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-21533 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
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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.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-21533 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2026-21533: Microsoft Windows Improper Privilege Management Vulnerabilitycisa-kev · 2026-02-10
External references
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[](https://www.csirts.com/cve/CVE-2026-21533)