Flarum Framework up to 1.8.15 Password Reset handle password recovery

Summaryinfo

A vulnerability was found in Flarum Framework up to 1.8.15. It has been classified as critical. This affects the function SavePasswordController::handle of the component Password Reset. This manipulation causes password recovery. This vulnerability is handled as CVE-2026-39923. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Flarum Framework up to 1.8.15. It has been declared as critical. Affected by this vulnerability is the function SavePasswordController::handle of the component Password Reset. The manipulation with an unknown input leads to a password recovery vulnerability. The CWE definition for the vulnerability is CWE-640. The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-39923 since 04/07/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1552 according to MITRE ATT&CK.

Upgrading to version 1.8.16 eliminates this vulnerability.

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Productinfo

Vendor

• Flarum

Name

• Framework

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7
• 1.8.8
• 1.8.9
• 1.8.10
• 1.8.11
• 1.8.12
• 1.8.13
• 1.8.14
• 1.8.15

Website

• Product: https://github.com/flarum/framework/

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