CVE-2026-48781

{
  "id": "CVE-2026-48781",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-17T13:20:43.060",
  "lastModified": "2026-10-26T12:10:00.130",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Postiz is an AI social media scheduling tool. In versions prior to 2.21.8, the Skool integration callback signed an attacker-controlled JSON blob into a session-shape JWT using the application's JWT_SECRET, and the auth middleware trusted every claim in that JWT without re-resolving the user from the database. Any authenticated Postiz user could forge a SUPERADMIN session and impersonate arbitrary organizations. This allowed Full Access to the following: all parts of Postiz, including users registered to the specific instance and the ability to post in the name of the victim's social media channels added to that Postiz instance. This issue has been fixed in version 2.21.8."
    },
    {
      "lang": "es",
      "value": "Postiz es una herramienta de programación de redes sociales con IA. En versiones anteriores a la 2.21.8, la devolución de llamada de integración de Skool firmó un blob JSON controlado por el atacante en un JWT con forma de sesión utilizando el JWT_SECRET de la aplicación, y el middleware de autenticación confió en cada declaración de ese JWT sin volver a resolver el usuario de la base de datos. Cualquier usuario autenticado de Postiz podría falsificar una sesión de SUPERADMIN e suplantar a organizaciones arbitrarias. Esto permitió Acceso Total a lo siguiente: todas las partes de Postiz, incluidos los usuarios registrados en la instancia específica y la capacidad de publicar en nombre de los canales de redes sociales de la víctima añadidos a esa instancia de Postiz. Este problema ha sido solucionado en la versión 2.21.8."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "gitroomhq",
          "product": "postiz-app",
          "versions": [
            {
              "version": "< 2.21.8",
              "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:C/C:H/I:H/A:H",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-18T14:25:47.270443Z",
          "id": "CVE-2026-48781",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-302"
        },
        {
          "lang": "en",
          "value": "CWE-345"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "http://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8",
      "source": "[email protected]"
    },
    {
      "url": "https://gadvisory.org/advisories/PSA-2026-2CAQ96",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j77w-h625-56q2",
      "source": "[email protected]"
    }
  ]
}