#VU105519 Path traversal in Windows - CVE-2025-26645

Vulnerability identifier: #VU105519

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-26645

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in Remote Desktop Client. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system, leading to arbitrary code execution.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows: 10 21H2 10.0.19041.3920 - 10 21H2 10.0.19044.4170, 10 1607 10.0.14393.10 - 10 1607 10.0.14393.7785, 10 1809 10.0.17763.1 - 10 1809 10.0.17763.6893

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-26645

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.