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ExploitedUsed in ransomware Added to CISA's list April 22, 2026

Microsoft Defender: Insufficient Granularity of Access Control Vulnerability

What to do: Run Windows Update and restart the PC.

Affects
Microsoft Defender
Identifier
CVE-2026-33825
What it is
Microsoft Defender contains an insufficient granularity of access control vulnerability that could allow an authorized attacker to escalate privileges locally.
Official guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Details
National Vulnerability Database entry

"Exploited" means CISA has evidence attackers are using this flaw. Being on the list does not mean your device was attacked; it means the update matters.