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CISA KEV Alert — Active Real-World Exploitation Confirmed
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog and is being actively exploited right now.
Microsoft Defender Privilege Escalation Access Control (CVE-2026-33825) | MSSP Advisory
High🔴 KEV ALERT
DateMay 6, 2026
CVECVE-2026-33825
CVSS Score7.8
Affecteddefender_antimalware_platform
📋Executive Summary
CISA flagged CVE-2026-33825 as a Known Exploited Vulnerability affecting Microsoft Defender, allowing authorized attackers to escalate privileges locally through insufficient access controls. This creates immediate risk across MSSP operations and every client environment running Defender.
⚠️Why It Matters for MSSPs
Your RMM agents and technician workstations running Defender become privilege escalation vectors that could compromise your entire client access infrastructure. Every client environment using Defender now represents a retention risk if they suffer a breach through this vector and you provided no warning or remediation guidance.
✅Recommended Action
Audit all Defender deployments across your stack and client environments within 24 hours. Deploy Microsoft patches immediately where available, implement access control hardening per vendor guidance, or prepare alternative endpoint protection rollouts for environments where patches fail.
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🏷️Threat Category
Vulnerability Disclosure
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