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Vulnerability record · CVE-2026-56171 · published 17 July 2026

CVE-2026-56171: Microsoft remote desktop web client vulnerability

Microsoft · Remote Desktop Web Client

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

7.5 CVSS 3.1 High EPSS 0.66% · top 50.4% CWE-359 · CWE-359
7.5CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
1References
22 Jul 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56171 Vendor AdvisoryRelease Notes

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-62873Microsoft windows admin center improper verification of cryptographic signature vulnerabilityImproper verification of cryptographic signature in Microsoft 365 Admin Center allows an unauthorized attacker to elevate privileges over a network.EPSS 0.61%9.8CVE-2019-0813Microsoft windows admin center vulnerabilityAn elevation of privilege vulnerability exists when Windows Admin Center improperly impersonates operations in certain situations, aka 'Windows Admin…EPSS 3.5%8.8CVE-2026-56196Microsoft windows admin center relative path traversal vulnerabilityRelative path traversal in Windows Admin Center allows an authorized attacker to execute code over a network.EPSS 1.0%8.8CVE-2026-56197Microsoft windows admin center command injection vulnerabilityImproper neutralization of special elements used in a command ('command injection') in Windows Admin Center allows an authorized attacker to execute …EPSS 0.99%8.8CVE-2026-56169Microsoft windows admin center improper authentication vulnerabilityImproper authentication in Windows Admin Center allows an authorized attacker to elevate privileges over a network.EPSS 0.75%8.8CVE-2026-41086Microsoft windows admin center improper access control vulnerabilityImproper access control in Windows Admin Center allows an authorized attacker to elevate privileges over a network.EPSS 0.78%8.8CVE-2026-26119Microsoft windows admin center improper authentication vulnerabilityImproper authentication in Windows Admin Center allows an authorized attacker to elevate privileges over a network.EPSS 0.81%8.3CVE-2026-35438Microsoft windows admin center missing authorization vulnerabilityMissing authorization in Windows Admin Center allows an authorized attacker to elevate privileges over a network.EPSS 0.63%

Source: NIST National Vulnerability Database (record CVE-2026-56171), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.