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CVE-2026-34576

Estado: AnalizadaAlta (8.3)—

Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the POST /public/v1/upload-from-url endpoint accepts a user-supplied URL and fetches it server-side using axios.get() with no SSRF protections. The only validation is a file extension check (.png, .jpg, etc.) which is trivially bypassed by appending an image extension to any URL path. An authenticated API user can fetch internal network resources, cloud instance metadata, and other internal services, with the response data uploaded to storage and returned to the attacker. This issue has been patched in version 2.21.3.

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.

SSRF sin protecciones en endpoint POST autenticado (PR:L) permite acceso a recursos internos y metadata de instancia; la extensión de imagen bypasable facilita exfiltración de datos internos.

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 ScanningThreat Intelligence ProgramSSL/TLS InspectionPrivileged Account ManagementNetwork SegmentationDisable or Remove Feature or Program

Tecnologías afectadas (1)

Gitroom — Postiz

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-34576",
  "cveTags": [],
  "metrics": {
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          "options": [
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      }
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          "valueDensity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
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          "availabilityRequirement": "NOT_DEFINED",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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      "url": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.3",
      "tags": [
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        "Release Notes"
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      "description": [
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          "value": "CWE-918"
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      "value": "Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the POST /public/v1/upload-from-url endpoint accepts a user-supplied URL and fetches it server-side using axios.get() with no SSRF protections. The only validation is a file extension check (.png, .jpg, etc.) which is trivially bypassed by appending an image extension to any URL path. An authenticated API user can fetch internal network resources, cloud instance metadata, and other internal services, with the response data uploaded to storage and returned to the attacker. This issue has been patched in version 2.21.3."
    },
    {
      "lang": "es",
      "value": "Postiz es una herramienta de programación de redes sociales con IA. Antes de la versión 2.21.3, el endpoint POST /public/v1/upload-from-url acepta una URL proporcionada por el usuario y la obtiene del lado del servidor usando axios.get() sin protecciones SSRF. La única validación es una verificación de extensión de archivo (.png, .jpg, etc.) que se evade trivialmente al añadir una extensión de imagen a cualquier ruta de URL. Un usuario de API autenticado puede obtener recursos de red internos, metadatos de instancias en la nube y otros servicios internos, con los datos de respuesta cargados al almacenamiento y devueltos al atacante. Este problema ha sido parcheado en la versión 2.21.3."
    }
  ],
  "lastModified": "2026-07-24T21:10:00.143",
  "configurations": [
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      "nodes": [
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          "negate": false,
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}