# CVE-2026-39923

## Summary

- **CVE ID:** CVE-2026-39923
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (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)
- **CWE:** CWE-324
- **Published:** Aug 5, 2026
- **Last Modified:** Aug 14, 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.

## Affected Products

- Flarum — Flarum Framework (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._