CVE-2026-27707

{
  "id": "CVE-2026-27707",
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          "id": "CVE-2026-27707",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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              "automatable": "yes"
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            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-02-27T20:22:11.831766Z"
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          "baseScore": 7.3,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 3.9
      },
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          "baseSeverity": "CRITICAL",
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          "userInteraction": "NONE",
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  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "seerr-team",
          "product": "seerr",
          "versions": [
            {
              "status": "affected",
              "version": ">= 2.0.0, < 3.1.0"
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  "published": "2026-02-27T20:21:38.760",
  "references": [
    {
      "url": "https://github.com/seerr-team/seerr/commit/4ae20684092b5b28527b23dfbc1a3417858fee8e",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/seerr-team/seerr/releases/tag/v3.1.0",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/seerr-team/seerr/security/advisories/GHSA-rc4w-7m3r-c2f7",
      "tags": [
        "Exploit",
        "Vendor Advisory"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        },
        {
          "lang": "en",
          "value": "CWE-807"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Seerr is an open-source media request and discovery manager for Jellyfin, Plex, and Emby. Starting in version 2.0.0 and prior to version 3.1.0, an authentication guard logic flaw in `POST /api/v1/auth/jellyfin` allows an unauthenticated attacker to register a new Seerr account on any Plex-configured instance by authenticating with an attacker-controlled Jellyfin server. The attacker receives an authenticated session and can immediately use the application with default permissions, including the ability to submit media requests to Radarr/Sonarr. Any Seerr deployment where all three of the following are true may be vulnerable: `settings.main.mediaServerType` is set to `PLEX` (the most common deployment).; `settings.jellyfin.ip` is set to `\"\"` (default, meaning Jellyfin was never configured); and `settings.main.newPlexLogin` is set to `true` (default). Jellyfin-configured and Emby-configured deployments are not affected. Version 3.1.0 of Seerr fixes this issue."
    },
    {
      "lang": "es",
      "value": "Seerr es un gestor de solicitudes y descubrimiento de medios de código abierto para Jellyfin, Plex y Emby. A partir de la versión 2.0.0 y antes de la versión 3.1.0, una falla lógica en la protección de autenticación en 'POST /API/v1/auth/jellyfin' permite a un atacante no autenticado registrar una nueva cuenta de Seerr en cualquier instancia configurada con Plex autenticándose con un servidor Jellyfin controlado por el atacante. El atacante recibe una sesión autenticada y puede usar inmediatamente la aplicación con permisos predeterminados, incluida la capacidad de enviar solicitudes de medios a Radarr/Sonarr. Cualquier implementación de Seerr donde se cumplan las tres condiciones siguientes puede ser vulnerable: 'settings.main.mediaServerType' está configurado como 'PLEX' (la implementación más común).; 'settings.jellyfin.ip' está configurado como '\"\"' (predeterminado, lo que significa que Jellyfin nunca fue configurado); y 'settings.main.newPlexLogin' está configurado como 'true' (predeterminado). Las implementaciones configuradas con Jellyfin y Emby no se ven afectadas. La versión 3.1.0 de Seerr soluciona este problema."
    }
  ],
  "lastModified": "2026-06-17T10:27:33.240",
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