CVE intelligenceCISA KEVRansomware use

CVE-2026-33825

Microsoft Defender Insufficient Granularity of Access Control Vulnerability

Published Apr 14, 2026Sources checked Nov 14, 2026

7.8HIGHCVSS out of 10

What this means

Actively exploited

CISA lists CVE-2026-33825 in its Known Exploited Vulnerabilities catalog, which means exploitation has been observed. The entry applies to Microsoft Defender.

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

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Apr 30, 2026

Release Notes

Vendor-listed releases

4.18.26030.3011

CISA KEVListedObserved exploitation

EPSS6.9%Estimated 30-day exploitation probability

Ransomware useReported by CISACISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-33825?

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

Source: NVD

CISA says:Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA catalog due date May 6, 2026