MSRC-CVE-2026-56171 — Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Can I install the update via a PowerShell module?
Yes, please see instructions here: How to Update the RD Web Client. The link to the PowerShell Gallery is here.

Security updates
2.7.4 — https://techcommunity.microsoft.com/blog/windows-admin-center-blog/windows-admin-center-version-2606-is-now-generally-available/4530811
2.1.65.2 — https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/web-client-whats-new

Vulnerabilities 1

High 7.1

CVE-2026-56171

Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability

Exposure of private personal information to an unauthorized actor in Windows RDP allows an unauthorized attacker to disclose information over a network.

Microsoft Windows Admin Center Remote Desktop Web Client Windows

Jul 17, 2026

Revision history

2026-07-16 #1
Information published.

References

CVE-2026-56171 Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56171
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss