CVE-2026-39923: Flarum Framework

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Flarum before 1.8.16 contains a password reset token expiry bypass vulnerability that allows unauthenticated attackers to reuse expired password reset tokens by submitting them directly to the reset processing endpoint. The SavePasswordController::handle() method calls PasswordToken::findOrFail() without performing any expiry validation, allowing attackers to bypass the 24-hour token lifetime enforced only during form rendering and change any account's password to gain an authenticated session.

Affected products

• Flarum Flarum Framework: before 1.8.16 (fixed in 1.8.16)

Published 2026-08-05. Last modified 2026-09-09.