CVE-2026-50636

Estado: AplazadaAlta (8.7)—

The RemoteControl API methods invite_participants and remind_participants pass a caller-supplied token-ID array into TokenDynamic::findUninvited(), which concatenates the values directly into a tid IN ('...') SQL clause without parameterization or input validation. A remote, authenticated attacker holding the tokens/update permission on a survey can inject a crafted array element to perform SQL injection.

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Because LimeSurvey configures its PDO connection with emulated prepared statements (emulatePrepare = true) and does not disable MySQL multi-statements, the injection supports stacked queries: the attacker can append arbitrary additional statements (INSERT/UPDATE/DELETE/DROP/CREATE) after the original SELECT. This permits both arbitrary read of any data in the database, such as administrator bcrypt password hashes (lime_users), survey response PII, session records, and global settings, all recoverable via a SLEEP() time-based blind oracle, and arbitrary write/destruction of that data, including directly overwriting the administrator password hash for immediate account takeover or dropping/truncating tables. Reads and writes extend to any schema the application's database user can access. The RemoteControl interface (RPCInterface = json/xml) must be enabled, which is not the default.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/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: 0.60%
Percentil entre todas las CVEs puntuadas: 47
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement95 %
Impacto principalT1005 Data from Local Systemcollection90 %
Impacto secundarioT1078.001 Default Accountsstealth · persistence · privilege escalation · initial access85 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact90 %

SQL injection en API autenticada remota (PR:L, AV:N) explotable sin UI:R permite lectura de datos (password hashes, PII) y escritura destructiva (overwrite admin password = account takeover). CWE-89 + stacked queries.

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 Scanning Threat Intelligence Program Restrict File and Directory Permissions Privileged Account Management Password Policies Remote Data Storage

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-89

Referencias

JSON original (NVD)

Mostrar

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      "url": "https://www.limesurvey.org/",
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      "value": "The RemoteControl API methods invite_participants and remind_participants pass a caller-supplied token-ID array into TokenDynamic::findUninvited(), which concatenates the values directly into a tid IN ('...') SQL clause without parameterization or input validation. A remote, authenticated attacker holding the tokens/update permission on a survey can inject a crafted array element to perform SQL injection. Because LimeSurvey configures its PDO connection with emulated prepared statements (emulatePrepare = true) and does not disable MySQL multi-statements, the injection supports stacked queries: the attacker can append arbitrary additional statements (INSERT/UPDATE/DELETE/DROP/CREATE) after the original SELECT. This permits both arbitrary read of any data in the database, such as administrator bcrypt password hashes (lime_users), survey response PII, session records, and global settings, all recoverable via a SLEEP() time-based blind oracle, and arbitrary write/destruction of that data, including directly overwriting the administrator password hash for immediate account takeover or dropping/truncating tables. Reads and writes extend to any schema the application's database user can access. The RemoteControl interface (RPCInterface = json/xml) must be enabled, which is not the default."
    },
    {
      "lang": "es",
      "value": "Los métodos de la API RemoteControl invite_participants y remind_participants pasan un array de ID de token proporcionado por el llamador a TokenDynamic::findUninvited(), que concatena los valores directamente en una cláusula SQL tid IN ('...') sin parametrización o validación de entrada. Un atacante remoto y autenticado que posee el permiso tokens/update en una encuesta puede inyectar un elemento de array manipulado para realizar una inyección SQL. Debido a que LimeSurvey configura su conexión PDO con sentencias preparadas emuladas (emulatePrepare = true) y no deshabilita las multi-sentencias de MySQL, la inyección soporta consultas apiladas: el atacante puede añadir sentencias adicionales arbitrarias (INSERT/UPDATE/DELETE/DROP/CREATE) después del SELECT original. Esto permite tanto la lectura arbitraria de cualquier dato en la base de datos, como hashes de contraseña bcrypt de administrador (lime_users), PII de respuestas de encuestas, registros de sesión y configuraciones globales, todo recuperable a través de un oráculo ciego basado en tiempo SLEEP(), como la escritura/destrucción arbitraria de esos datos, incluyendo la sobrescritura directa del hash de contraseña del administrador para una toma de control de cuenta inmediata o la eliminación/truncamiento de tablas. Las lecturas y escrituras se extienden a cualquier esquema al que el usuario de la base de datos de la aplicación pueda acceder. La interfaz RemoteControl (RPCInterface = json/xml) debe estar habilitada, lo cual no es la configuración predeterminada."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
  "sourceIdentifier": "disclosure@vulncheck.com"
}