CVE-2026-96281
On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could use this to expose other users of the same system to an app version with unfixed vulnerabilities.
- Published Sep 27, 2026
- CVSS 6.2 medium
- 0.2% chance of exploitation in the next 30 days (EPSS)