Threat Intelligence / CVE / CVE-2026-21533
CVE-2026-21533
CISA KEVImproper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.
CVSS v3 vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
CWE-269
Threats tracking this CVE
- February 2026 Patch Tuesday: Six Zero-Days Among 59 CVEs — CRITICAL
- February 2026 Patch Tuesday: Six Zero-Days Among 59 CVEs — CrowdStrike-Discovered RDP EoP Exploited Since December 2025 — CRITICAL
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533
- https://www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktop
- https://www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21533
Full detection coverage & IOCs for threats exploiting CVE-2026-21533 are available via the Threadlinqs MCP server (Purple tier). View plans →