CVE-2026-39924 — Flarum < 1.8.16 Session Persistence via Improper Access Token Revocation
Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim ch…
Published: 2026-08-05 · CVSS: 7.6 · CVSS 4.0
Flarum before 1.8.16 contains an improper session invalidation vulnerability that allows attackers who hold a valid session token to retain full account access after a victim changes their password, because the access_tokens table is never cleared on password change events. The TokensClearer::clearPasswordTokens() function only removes rows from the password_tokens table while leaving all active session cookies and API bearer tokens intact, including long-lived RememberAccessToken entries, and administrator-forced password resets via the user update endpoint are equally ineffective at revoking attacker-held sessions.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7