CVE-2026-33825 — Microsoft Defender Insufficient Granularity of Access Control Vulnerability
Overview
Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.
Vulnerability details
- CVE ID
- CVE-2026-33825
- Vulnerability
- Microsoft Defender Insufficient Granularity of Access Control Vulnerability
- Vendor
- Microsoft
- Affected products
- Microsoft: Defender
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- EPSS score
- 6.2% probability of exploitation in 30 days · 93th percentile
- Published
- 2026-04-22
Remediation guidance
CVE-2026-33825 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for Microsoft the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
FIRST EPSS estimates a 6.2% probability that CVE-2026-33825 will be exploited within the next 30 days (93th percentile of all CVEs) — useful for risk-based patch sequencing.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2026-33825 — and stay ahead of the next one
CVE-2026-33825 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2026-33825 and other Microsoft issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
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