CVE-2026-39924

Description

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.

References

https://www.vulncheck.com/advisories/flarum-session-persistence-via-improper-access-token-revocation

https://github.com/flarum/framework/releases/tag/v1.8.16

https://github.com/flarum/framework/pull/4546

https://github.com/flarum/framework/commit/5f080293a029d0d273eb9678d597c74ea86a3bcc

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS