# CVE-2026-33825

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

- Page: https://www.vulneraibility.com/cve/CVE-2026-33825
- CVSS: 7.8
- Known exploited: yes, in CISA KEV since 2026-04-22; CISA due date 2026-05-06; known ransomware use
- EPSS: 6.75%
- Unvetted proof-of-concept code on GitHub: 7 GitHub proofs of concept (first 2026-04-17)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-04-23)
- Weakness: CWE-1220
- Published: 2026-04-14

## Affected versions

- Microsoft Microsoft Defender Antimalware Platform: affected >= 4.0.0.0 and < 4.18.26030.3011

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825
- [advisory] https://www.huntress.com/blog/nightmare-eclipse-intrusion
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33825

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.