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CVE-2026-21533 is a local elevation-of-privilege vulnerability in Windows Remote Desktop Services caused by improper privilege management. The flaw affects Windows Remote Desktop components and allows an authorized or authenticated local attacker with existing access to a vulnerable system to abuse incorrect privilege handling and escalate from a low-privileged context to SYSTEM. Reporting on in-the-wild exploitation characterizes the issue as a logic flaw in privilege enforcement within Remote Desktop Services rather than a memory corruption bug.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 7 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
70 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A logic vulnerability in Remote Desktop Services components that enables privilege escalation to SYSTEM by modifying registry-based service parameters.
An elevation of privilege vulnerability in Windows Remote Desktop Services that was exploited in the wild against U.S. and Canada-based entities, likely useful after initial RDP access.
A vulnerability for which an alleged exploit is being advertised for sale; no further technical details are provided in the content.
A high-severity Windows Remote Desktop Services Elevation of Privilege (EoP) vulnerability caused by improper privilege management, allowing an authorized standard user to locally escalate to administrative control.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.