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CVE-2026-43984

Estado: AplazadaAlta (8.9)—

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose `log_js_errors` to any authenticated user, including guest users when guest access is enabled. The endpoint writes attacker-controlled strings directly into the main application log. The administrator-only `logFile` view then reads that log file and embeds it into an HTML response without escaping. This creates a stored cross-site scripting condition where a low-privilege guest can inject HTML or JavaScript into the log file and have it execute in an administrator's browser when the log viewer is opened. Version 2.17.1 patches the issue.

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.

XSS almacenado: guest inyecta JS en logs, se ejecuta en navegador del admin (T1189). JavaScript en navegador (T1059.007). Posible acceso a cuentas admin mediante scripts maliciosos (T1098). AV:N/PR:L/UI:R confirma la necesidad de interacción del admin.

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

Restrict Web-Based ContentUser TrainingExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication 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.

Tautulli — TautulliAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-43984",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-43984",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-04T17:04:03.343436Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.9,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 2.3
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "Tautulli",
          "product": "Tautulli",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.17.1"
            }
          ]
        }
      ]
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  "published": "2026-06-04T16:16:37.883",
  "references": [
    {
      "url": "https://github.com/Tautulli/Tautulli/releases/tag/v2.17.1",
      "source": "security-advisories@github.com"
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      "url": "https://github.com/Tautulli/Tautulli/security/advisories/GHSA-f4j7-pjwc-4jrr",
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      "description": [
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          "value": "CWE-79"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose `log_js_errors` to any authenticated user, including guest users when guest access is enabled. The endpoint writes attacker-controlled strings directly into the main application log. The administrator-only `logFile` view then reads that log file and embeds it into an HTML response without escaping. This creates a stored cross-site scripting condition where a low-privilege guest can inject HTML or JavaScript into the log file and have it execute in an administrator's browser when the log viewer is opened. Version 2.17.1 patches the issue."
    },
    {
      "lang": "es",
      "value": "Tautulli es una herramienta de monitoreo y seguimiento basada en Python para Plex Media Server. Las versiones anteriores a la 2.17.1 exponen 'log_js_errors' a cualquier usuario autenticado, incluyendo a los usuarios invitados cuando el acceso de invitado está habilitado. El endpoint escribe cadenas controladas por el atacante directamente en el registro principal de la aplicación. La vista 'logFile' solo para administradores luego lee ese archivo de registro y lo incrusta en una respuesta HTML sin escapar. Esto crea una condición de cross-site scripting almacenado donde un invitado de bajo privilegio puede inyectar HTML o JavaScript en el archivo de registro y hacer que se ejecute en el navegador de un administrador cuando se abre el visor de registros. La versión 2.17.1 corrige el problema."
    }
  ],
  "lastModified": "2026-07-22T20:10:00.127",
  "sourceIdentifier": "security-advisories@github.com"
}