#VU109121 External Control of File Name or Path in Defender for Endpoint for Linux - CVE-2025-26684

Vulnerability identifier: #VU109121

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-26684

CWE-ID: CWE-73

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Defender for Endpoint for Linux
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Microsoft

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to external control of file name or path in Microsoft Defender for Endpoint. A local administrator can gain elevated privileges on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Defender for Endpoint for Linux: All versions

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External links
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26684

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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