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CVE-2026-21533: Microsoft Windows Improper Privilege Management Vulnerability

criticalknown exploitedpublic exploitCVE-2026-21533
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation 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

vendor: Microsoftproduct: WindowsPrivilege escalation
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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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-02-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-21533

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-21533coverage & exploitation statusNVD · CVE.org

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