CLASSIFICATION: CYBER THREAT ASSESSMENT CVE-2026-33825 affects Microsoft Defender and permits privilege escalation through insufficient access control granularity when exploited by an authenticated threat actor with local system access. The vulnerability was catalogued in CISA's Known Exploited Vulnerabilities database, indicating active exploitation in operational environments. Affected organizations running vulnerable Defender instances should prioritize patching to restrict lateral movement capabilities and prevent token elevation attacks. Remediation guidance is available through Microsoft Security Advisory channels.