CVE-2026-33825
High 7.8 Exploited in the wild (KEV) Used in ransomware campaigns
Confirmed active exploitation — CISA KEV catalog
- Name
- Microsoft Defender Insufficient Granularity of Access Control Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.
Metrics
- CVSS 3.1
-
7.8 (HIGH)
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 7% (percentile: 94) as of 1 November 2026
- CWE
- CWE-1220
Affected products
microsoft: defender antimalware platform
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026… US Government Resource
- https://www.huntress.com/blog/nightmare-eclipse-intrusion Third Party Advisory