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CVE-2026-33825: Microsoft Defender Insufficient Granularity of Access Control Vulnerability

criticalknown exploitedpublic exploitCVE-2026-33825
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 an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: DefenderPrivilege escalation
What
An insufficient granularity of access control vulnerability could allow an authorized attacker to escalate privileges locally.
Who is affected
Users of Microsoft Defender.
Urgency
Remediation is urgent as the vulnerability is critical and has been exploited.
Action
Apply the latest security updates provided 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
2026-04-22
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-33825

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-2026-33825coverage & exploitation statusNVD · CVE.org

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