Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires an admin user on the client to connect to a malicious server, and that could allow the attacker to gain code execution on the client.
How could an attacker exploit this vulnerability?
In the case of a Remote Desktop connection, an attacker with control of a Remote Desktop Server could trigger a remote code execution (RCE) on the RDP client machine when a victim connects to the attacker's server with the vulnerable Remote Desktop Client.
Security updates
2.0.365.0 — https://learn.microsoft.com/en-us/windows-app/whats-new?toc=admins%2Ftoc.json&tabs=windows
10.0.17763.7009 — https://support.microsoft.com/help/5053596
1.2.6017.0 — https://learn.microsoft.com/en-us/azure/virtual-desktop/whats-new-client-windows#updates-for-version-1260170
10.0.20348.3328 — https://support.microsoft.com/help/5053603
10.0.20348.3270 — https://support.microsoft.com/help/5053638
10.0.19044.5608 — https://support.microsoft.com/help/5053606
10.0.22621.5039 — https://support.microsoft.com/help/5053602
10.0.26100.3476 — https://support.microsoft.com/help/5053598
10.0.26100.3403 — https://support.microsoft.com/help/5053636
10.0.25398.1486 — https://support.microsoft.com/help/5053599
10.0.10240.20947 — https://support.microsoft.com/help/5053618
10.0.14393.7876 — https://support.microsoft.com/help/5053594
6.0.6003.23168 — https://support.microsoft.com/help/5053888
6.0.6003.23168 — https://support.microsoft.com/help/5053995
6.1.7601.27618 — https://support.microsoft.com/help/5053620
6.1.7601.27618 — https://support.microsoft.com/help/5053627
6.2.9200.25368 — https://support.microsoft.com/help/5053886
6.3.9600.22470 — https://support.microsoft.com/help/5053887
Vulnerabilities 1
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High 8.8
Remote Desktop Client Remote Code Execution Vulnerability
Relative path traversal in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
Revision history
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#2
Updated links to security updates. This is an informational change only.
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#1
Information published.
References
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CVE-2025-26645 Remote Desktop Client Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26645
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss