CVE-2026-33825
Actively exploited. CVE-2026-33825 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-22) — 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-2026-33825 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.
CSIRTS triage
- 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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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 93% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-33825 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-2026-33825: Microsoft Defender Insufficient Granularity of Access Control Vulnerabilitycisa-kev · 2026-04-22
External references
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[](https://www.csirts.com/cve/CVE-2026-33825)