CVE-2026-39923

Summary

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 Software

Weaknesses

• CWE-324: Use of a Key Past its Expiration Date

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

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

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