CVE-2026-50635

Estado: AplazadaAlta (8.7)—

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation.

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A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.66%
Percentil entre todas las CVEs puntuadas: 50
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1203 Exploitation for Client Executionexecution85 %
Impacto principalT1078.001 Default Accountsstealth · persistence · privilege escalation · initial access90 %
Impacto secundarioT1556.001 Domain Controller Authenticationdefense impairment · persistence · credential access80 %

UI:R (interacción del usuario: abrir/clicar el enlace de reseteo) + AV:N requiere T1203. Impactos: acceso a cuenta válida (T1078.001) tras validar el token, manipulación de credenciales (T1556.001) al cambiar contraseña. CWE-640: insuficiente validación del Host header.

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

Multi-factor Authentication User Training Privileged Process Integrity Privileged Account Management Password Policies Application Isolation and Sandboxing

Tecnologías afectadas (1)

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

Limesurvey — Limesurvey^AI

CWE

CWE-640

Referencias

JSON original (NVD)

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      "url": "https://www.limesurvey.org/",
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      "value": "LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account."
    },
    {
      "lang": "es",
      "value": "LimeSurvey construye enlaces de restablecimiento de contraseña de cuenta a partir del encabezado Host HTTP proporcionado por el cliente sin validarlo. La lista de permitidos opcional allowedHosts que restringiría esto no está definida en la configuración predeterminada (y documentada), por lo que LSHttpRequest::checkIsAllowedHost() no realiza ninguna operación. Un atacante remoto y no autenticado que envía una solicitud de contraseña olvidada para una cuenta conocida (que requiere solo el nombre de usuario y el correo electrónico del objetivo) con un encabezado Host falsificado hace que LimeSurvey envíe por correo electrónico a esa cuenta un enlace de restablecimiento cuyo nombre de host está controlado por el atacante, mientras incrusta la validation_key genuina. Cuando el destinatario o un escáner automatizado de enlaces de seguridad de correo entrante desreferencia el enlace, el token de restablecimiento válido se revela al atacante, quien lo reproduce contra el endpoint newPassword del host legítimo para establecer una nueva contraseña y tomar el control de la cuenta."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
  "sourceIdentifier": "disclosure@vulncheck.com"
}