CVE-2026-39386

{
  "id": "CVE-2026-39386",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-21T01:16:06.217",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Neko is a a self-hosted virtual browser that runs in Docker and uses WebRTC In versions 3.0.0 through 3.0.10 and 3.1.0 through 3.1.1, any authenticated user can immediately obtain full administrative control of the entire Neko instance (member management, room settings, broadcast control, session termination, etc.). This results in a complete compromise of the instance. The vulnerability has been patched in v3.0.11 and v3.1.2. If upgrading is not immediately possible, the following mitigations can reduce risk: Restrict access to trusted users only (avoid granting accounts to untrusted parties); ensure all user passwords are strong and only shared with trusted individuals; run the instance only when needed; avoid leaving it continuously exposed; place the instance behind authentication layers such as a reverse proxy with additional access controls; disable or restrict access to the /api/profile endpoint if feasible; and/or monitor for suspicious privilege changes or unexpected administrative actions. Note that these are temporary mitigations and do not fully eliminate the vulnerability. Upgrading is strongly recommended."
    },
    {
      "lang": "es",
      "value": "Neko es un navegador virtual autoalojado que se ejecuta en Docker y utiliza WebRTC. En las versiones 3.0.0 a 3.0.10 y 3.1.0 a 3.1.1, cualquier usuario autenticado puede obtener inmediatamente control administrativo total de toda la instancia de Neko (gestión de miembros, configuración de sala, control de transmisión, terminación de sesión, etc.). Esto resulta en un compromiso completo de la instancia. La vulnerabilidad ha sido parcheada en v3.0.11 y v3.1.2. Si la actualización no es inmediatamente posible, las siguientes mitigaciones pueden reducir el riesgo: Restringir el acceso solo a usuarios de confianza (evitar conceder cuentas a partes no confiables); asegurar que todas las contraseñas de usuario sean fuertes y solo se compartan con individuos de confianza; ejecutar la instancia solo cuando sea necesario; evitar dejarla continuamente expuesta; colocar la instancia detrás de capas de autenticación como un proxy inverso con controles de acceso adicionales; deshabilitar o restringir el acceso al endpoint /api/profile si es factible; y/o monitorear cambios de privilegios sospechosos o acciones administrativas inesperadas. Tenga en cuenta que estas son mitigaciones temporales y no eliminan completamente la vulnerabilidad. Se recomienda encarecidamente la actualización."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "m1k1o",
          "product": "neko",
          "versions": [
            {
              "version": ">= 3.0.0, < 3.0.11",
              "status": "affected"
            },
            {
              "version": ">= 3.1.0, < 3.1.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
          "timestamp": "2026-04-21T00:00:00+00:00",
          "id": "CVE-2026-39386",
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
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          "role": "CISA Coordinator",
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-269"
        },
        {
          "lang": "en",
          "value": "CWE-284"
        },
        {
          "lang": "en",
          "value": "CWE-639"
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        {
          "lang": "en",
          "value": "CWE-862"
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  "configurations": [
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  "references": [
    {
      "url": "https://github.com/m1k1o/neko/releases/tag/v3.0.11",
      "source": "[email protected]",
      "tags": [
        "Product"
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    },
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      "url": "https://github.com/m1k1o/neko/releases/tag/v3.1.2",
      "source": "[email protected]",
      "tags": [
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    },
    {
      "url": "https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf",
      "source": "[email protected]",
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        "Mitigation",
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}