CVE-2026-33825

Microsoft Defender Antimalware Platform

Published 14 Apr 2026 · updated 24 Jul 2026 · Analyzed

7.8 High · CVSS 3.1, microsoft.com

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 22 Apr 2026, with a remediation deadline of 6 May 2026 for US federal agencies. It has been used in ransomware campaigns.

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.

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825 · Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33825 · US Government Resource
www.huntress.com/blog/nightmare-eclipse-intrusion · Third Party Advisory