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CVE-2026-41091: Microsoft Defender Link Following Vulnerability

criticalknown exploitedpublic exploitCVE-2026-41091
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 Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Microsoft DefenderPrivilege escalation
What
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
Who is affected
Users of Microsoft Defender.
Urgency
Remediation is urgent due to the critical nature of the vulnerability and active exploitation.
Action
Users should update Microsoft Defender to the latest version.

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
2026-05-20
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-41091

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-2026-41091coverage & exploitation statusNVD · CVE.org

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