CVE-2026-56171: Microsoft Remote Desktop Web Client

Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability

CVSS 7.1 HighEPSS 0.0066 · 52nd percentile

Published by the CVE Program (CNA: microsoft) at 17 Jul 2026, 21:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Microsoft	Remote Desktop Web Client	affected 2.0.0.0 to before 2.1.65.2 custom
Microsoft	Windows Admin Center	affected 1809.0 to before 2.7.4 custom

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Microsoft Remote Desktop Web Client (versions from 2.0.0.0 before 2.1.65.2) and Microsoft Windows Admin Center (versions from 1809.0 before 2.7.4) are affected by an information disclosure flaw in Windows Remote Desktop Protocol. An unauthorized attacker can exploit it over a network to obtain private personal information. The source gives few details. Upgrade Remote Desktop Web Client to 2.1.65.2 or later and Windows Admin Center to 2.7.4 or later.

Written 13 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.1	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C	CNA (microsoft)

CISA KEV Not listed.
EPSS 0.0066, the 52nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

17 Jul 2026, 21:34 UTC Confirmed by the CVE List

Sources

References from the CNA

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56171 vendor-advisorypatch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.