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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-39923 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  VulnCheck
CVSS-B 9.2 CRITICAL
Vector:  CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/flarum/framework/commit/2803058d0f9dc38252326070b46d4484fe5a857d VulnCheck
https://github.com/flarum/framework/pull/4545 VulnCheck
https://github.com/flarum/framework/releases/tag/v1.8.16 VulnCheck
https://www.vulncheck.com/advisories/flarum-password-reset-token-expiry-bypass-via-post-reset VulnCheck

Weakness Enumeration

CWE-ID CWE Name Source
CWE-324 Use of a Key Past its Expiration Date VulnCheck  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-39923
NVD Published Date:
08/05/2026
NVD Last Modified:
08/05/2026
Source:
VulnCheck