CVE-2026-50376: Windows Remote Desktop Client Information Disclosure Vulnerability

In plain language

What this advisory means

A vulnerability in the Windows Remote Desktop Protocol (RDP) client can expose sensitive information to attackers. This happens when a user connects to a malicious server and has Remote Audio Playback and Recording enabled, potentially letting the attacker see uninitialized memory contents from the user's system.

Technical explanation

How the issue affects the environment

The Windows RDP client uses an uninitialized heap memory resource when handling Remote Audio Playback and Recording. If an attacker sets up a malicious RDP server and a user connects with these features enabled, the attacker could read uninitialized memory areas, leading to potential information disclosure. Exploitation requires user interaction to initiate the connection with the malicious server while these audio features are active.

Operational impact

Why teams should care

An unauthorized attacker could gain access to memory contents that may contain sensitive data, leading to information leaks and potential compromise of user data confidentiality. This can affect organizations relying on Remote Desktop for remote access and might expose critical information if exploited.

Affected and fixed releases

Temporary risk reduction

Disable Remote Audio Playback and Recording features in the RDP client or avoid connecting to untrusted or unknown Remote Desktop servers until the update is applied.

Evidence and validation checklist

• Microsoft Security Response Center advisory confirming uninitialized resource usage in Windows RDP client
• Description showing that user interaction involves enabling Remote Audio Playback and Recording and connecting to a malicious server
• CVSS score of 6.5 with user interaction required
• Confirmed fix versions and related update links from Microsoft
• No public exploit or exploitation reports