April 22, 2026 · Applied Cybernetics Group
CVE-2026-33825 — Microsoft Defender
known ransomware use
Microsoft Defender Insufficient Granularity of Access Control Vulnerability
- Added to KEV
2026-04-22- Federal due date
2026-05-06- Vendor
- Microsoft
- Product
- Defender
- EPSS
- 93.2th percentile (score 0.067, as of
2026-07-13) - NVD CVSS v3.1
- 7.8 (HIGH)
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-33825
CISA short description
Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.
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.
NVD description
Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.