CVE-2026-39923

High

Description

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.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Flarum Framework

PublishedAug 5, 2026

First seenAug 5, 2026

Weakness typeCWE-324CWE-324

How to fix

Update

Flarum Flarum Framework1.8.16 or later

Patches

github.com/flarum/framework/commit/2803058d0f9dc38252326070b46d4484fe5a857d

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
Flarum Flarum Framework	v < 1.8.16	1.8.16

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