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Luu, T.J.

🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

CVE-2026-33825: Microsoft Defender Insufficient Granularity of Access Control Vulnerability

infovulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesApril 21, 2026CVE-2026-33825

Summary

Microsoft Defender has a vulnerability in access control (the rules that decide what actions a user is allowed to perform) that could let an authorized attacker gain higher-level system permissions on a local computer. The vulnerability is currently being exploited by attackers in real-world attacks.

Solution / Mitigation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vulnerability Details

EPSS (30-day exploit probability)

EPSS: 0.1%

Patch Available

Yes

Exploit Maturity

🔥 Actively Exploited

Disclosure Date

April 21, 2026

Classification

Attack SophisticationModerate

Taxonomy References

CWE (Weakness Type)

CWE-1220

Monthly digest — independent AI security research

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-33825

First tracked: April 22, 2026 at 08:00 PM

Classified by LLM (prompt v3) · confidence: 95%