Execution with unnecessary privileges in lightdm-gtk-greeter - CVE-2025-62876
Published: January 7, 2026
Vulnerability identifier: #VU121033
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-62876
CWE-ID: CWE-250
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to application uses the KAuth helper to copy a background image is copied to the service user home directory. A local user can create a symbolic link into its home directory and copy the file to a arbitrary location with root privileges.
Affected software
lightdm-gtk-greeter
How to mitigate CVE-2025-62876
Install updates from vendor's website.
lightdm-gtk-greeter - update to 6.0.4