Microsoft Defender Insufficient Granularity of Access Control Vulnerability

Date Apr 22, 2026
Type KEV
Signal Known exploited
Vendor / Product Microsoft ยท Defender
CVE CVE-2026-33825
Known exploited CVE-2026-33825

Summary

Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.

Why it matters

CVE-2026-33825 is listed in CISA's Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. CISA remediation deadline: 2026-05-06. Treat remediation as urgent.

Operator check

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.