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CVE-2026-39923

Estado: AplazadaCrítica (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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:N sin autenticación permite explotar la falta de validación de expiración de tokens en el endpoint remoto (T1190). El atacante reutiliza tokens expirados para resetear contraseñas ajenas, obteniendo credenciales válidas (T1078.001) y control de cuentas (T1098.001).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementPassword PoliciesNetwork SegmentationMulti-factor AuthenticationLimit Access to Resource Over Network

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Flarum — FlarumAI

CWE

Referencias

JSON original (NVD)

Mostrar
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          "options": [
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              "exploitation": "none"
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              "technicalImpact": "total"
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      "url": "https://github.com/flarum/framework/pull/4545",
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    {
      "url": "https://github.com/flarum/framework/releases/tag/v1.8.16",
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      "url": "https://www.vulncheck.com/advisories/flarum-password-reset-token-expiry-bypass-via-post-reset",
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      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-09-09T20:35:08.537",
  "sourceIdentifier": "disclosure@vulncheck.com"
}