CVE-2026-25704 MEDIUM

CVE-2026-25704: Incomplete privilege drop for com.system76.CosmicGreeter.GetUserData

Vendor Pop-Os
Product cosmic-greeter
Weakness CWE-271
Published March 30, 2026
Last update April 16, 2026

CVSS base score

5.8/10
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

A Privilege Dropping / Lowering Errors/Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in  cosmic-greeter can allow an attacker to regain privileges that should have been dropped and abuse them in the racy checking logic. This issue affects cosmic-greeter before https://github.Com/pop-os/cosmic-greeter/pull/426.

Key dates

02Disclosure timeline

March 30, 2026 CVE published
April 16, 2026 Record updated