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‘RegPwn’ Windows Registry Vulnerability Enables Full System Access to Attackers

A critical vulnerability identified as "RegPwn" (CVE-2026-24291) has been discovered within the Windows operating system. This vulnerability allows users with low privileges to escalate their access to SYSTEM level, posing a significant security risk.

HBy Hazel CaldwellMar 18, 20261 min read

A critical vulnerability identified as "RegPwn" (CVE-2026-24291) has been discovered within the Windows operating system. This vulnerability allows users with low privileges to escalate their access to SYSTEM level, posing a significant security risk.

The vulnerability was discovered by the MDSec red team and has been exploited in internal security assessments since January 2025. It was subsequently addressed in the March 2026 Microsoft Patch Tuesday update.

The vulnerability targets the management of Windows accessibility features, such as the On-Screen Keyboard and Narrator. These features are intended to assist users and operate with elevated integrity levels.

Windows creates a specific registry key to store configuration settings for accessibility tools. This registry key is writable by low-privileged users, creating a potential security flaw. During login, these settings are copied to the local machine registry hive by a system process, maintaining user write access.

A critical vulnerability identified as "RegPwn" (CVE-2026-24291) has been discovered within the Windows operating system.
Hazel Caldwell · Thehackingpost

This vulnerability is particularly concerning when these user-controlled settings interact with the Windows Secure Desktop environment.

An attacker can exploit this flaw by modifying their user-level accessibility registry key and creating an opportunistic lock on a system file. When the system attempts to copy the modified settings, the attacker can replace the local machine registry key with a symbolic link to a different system registry key, allowing unauthorized writes to protected registry areas.

Microsoft has released a patch for CVE-2026-24291 as part of its standard security updates. System administrators are advised to apply these updates promptly to mitigate the risk of this vulnerability. Additionally, MDSec has made its exploit code publicly available for research purposes on GitHub.

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It is crucial for security teams to ensure their systems are updated and to review the available exploit code to understand and defend against potential attacks.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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