What is CVE-2026-56171?

CVE-2026-56171 is a high-severity vulnerability in Microsoft Remote Desktop Web Client, classified under Exposure of Private Personal Information to an Unauthorized Actor. CVSS score: 7.1/10. Published 2026-07-17.

How severe is CVE-2026-56171?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Microsoft Remote Desktop Web Client

CVE-2026-56171

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

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

Affected products

Microsoft Remote Desktop Web Client — versions 2.0.0.0
Microsoft Windows Admin Center — versions 1809.0

Weakness classification (CWE)

CWE-359 — Exposure of Private Personal Information to an Unauthorized Actor

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-56171?: CVE-2026-56171 is a high-severity vulnerability in Microsoft Remote Desktop Web Client, classified under Exposure of Private Personal Information to an Unauthorized Actor. CVSS score: 7.1/10. Published 2026-07-17.
How severe is CVE-2026-56171?: High severity. CVSS v3 base score is 7.1 out of 10.