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CVE-2026-21519: Microsoft Windows Type Confusion Vulnerability

criticalknown exploitedCVE-2026-21519
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 Desktop Windows Manager contains a type confusion vulnerability that could allow an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: WindowsPrivilege escalation
What
A type confusion vulnerability could allow an authorized attacker to elevate privileges locally.
Who is affected
Deployments of Microsoft Desktop Windows Manager.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the security patch from 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-2026-21519

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-2026-21519coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Windows Type

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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