CVE-2026-96281 — Flatpak: flatpak: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes
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 unprivil…
Published: 2026-09-27 · CVSS: 6.2 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7