Risk Letters

Exploited vulnerability

CVE-2026-33825

TLP:CLEAR

Microsoft Defender Insufficient Granularity of Access Control Vulnerability

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

Facts

  • Vendor: Microsoft
  • Product: Defender
  • CVSS: 7.8
  • EPSS (probability of exploitation within 30 days): 6.7 %
  • On CISA's Known Exploited Vulnerabilities list since: 22 April 2026
  • First known exploitation: 22 April 2026
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 6 May 2026
  • Weakness: CWE-1220
  • First seen by Risk Letters: 22 April 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD