CVE-2026-39923
Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /reset
- State
- Published
- Severity
- 9.2 Critical
- Published
- Aug 5, 2026
- Updated
- Aug 14, 2026
- Reserved
- Apr 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | 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 | VulnCheck |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-324 Use of a Key Past its Expiration Date
Affected Products
| Product | Versions |
|---|---|
Flarum FrameworkFlarum |
|
References
- Release Notesrelease-notes
- Pull Requestissue-tracking
- Patch Commitpatch
- https://www.vulncheck.com/advisories/flarum-password-reset-token-expiry-bypass-via-post-resetthird-party-advisory
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