VulnerabilityAnalyzed

CVE-2026-33825

Microsoft Defender Insufficient Granularity of Access Control Vulnerability

KEVHIGH 7.8EPSS 6.75%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 6 May 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

Description

Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.

CVSS 3.1: 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 6.75% probability · 94th percentile
CISA KEV: Listed 22 April 2026 · due 6 May 2026 · used in ransomware campaigns
Weakness: CWE-1220
Affected: microsoft/defender antimalware platform
Source: secure@microsoft.com

CISA notes

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825 ; https://nvd.nist.gov/vuln/detail/CVE-2026-33825

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.