CVE-2026-21533

# CVE-2026-21533: Windows RDS Privilege Escalation **What it is:** CVE-2026-21533 is a privilege escalation flaw in Microsoft Windows Remote Desktop Services that permits an authenticated local attacker to gain elevated system privileges through improper privilege management controls. **Impact:** An attacker with valid credentials can move from standard user access to SYSTEM or administrator level, enabling full system compromise, lateral movement, and persistence mechanisms. **Action items:** Monitor your Windows systems for exploitation attempts targeting RDS processes and services; apply Microsoft security patches when released; restrict RDS access to necessary users only; implement credential guard and enforce strong authentication on RDP endpoints; review privileged access logs for suspicious elevation activity.