CVE-2026-39923

critical · 9.2

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.

9.2

CVSS

0.3%

EPSS (exploit prob.)

18th

EPSS percentile

2026-08-05

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-324

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-39923