Privilege escalation in Microsoft Defender

1) External Control of File Name or Path

EUVDB-ID: #VU109121

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 - External Control of File Name or Path

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:microsoft:defender_for_endpoint_for_linux:*:*:*:*:*:*:*:*

External links

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

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.