What’s Vulnerable › Vulnerabilities

CVE-2026-39923: Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /reset

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-05 · updated 2026-10-23
• Weakness: CWE-324

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 Framework: before 1.8.16 — fixed in 1.8.16

How to fix

Upgrade to a fixed version: Flarum Framework 1.8.16. Check the vendor advisory for mitigations.

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

Get alerted when CVE-2026-39923 or the next vulnerability affects your stack