CVE-2026-48781

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{"affected": [{"affectedData": [{"product": "postiz-app", "vendor": "gitroomhq", "versions": [{"status": "affected", "version": "< 2.21.8"}]}], "source": "security-advisories@github.com"}], "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 programaci\u00f3n de redes sociales con IA. En versiones anteriores a la 2.21.8, la devoluci\u00f3n de llamada de integraci\u00f3n de Skool firm\u00f3 un blob JSON controlado por el atacante en un JWT con forma de sesi\u00f3n utilizando el JWT_SECRET de la aplicaci\u00f3n, y el middleware de autenticaci\u00f3n confi\u00f3 en cada declaraci\u00f3n de ese JWT sin volver a resolver el usuario de la base de datos. Cualquier usuario autenticado de Postiz podr\u00eda falsificar una sesi\u00f3n de SUPERADMIN e suplantar a organizaciones arbitrarias. Esto permiti\u00f3 Acceso Total a lo siguiente: todas las partes de Postiz, incluidos los usuarios registrados en la instancia espec\u00edfica y la capacidad de publicar en nombre de los canales de redes sociales de la v\u00edctima a\u00f1adidos a esa instancia de Postiz. Este problema ha sido solucionado en la versi\u00f3n 2.21.8."}], "id": "CVE-2026-48781", "lastModified": "2026-10-26T12:10:00.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-48781", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-18T14:25:47.270443Z", "version": "2.0.3"}}]}, "published": "2026-06-17T13:20:43.060", "references": [{"source": "security-advisories@github.com", "url": "http://github.com/gitroomhq/postiz-app/releases/tag/v2.21.8"}, {"source": "security-advisories@github.com", "url": "https://gadvisory.org/advisories/PSA-2026-2CAQ96"}, {"source": "security-advisories@github.com", "url": "https://github.com/gitroomhq/postiz-app/commit/23696d2973510ae1f3f48bfa41a6bfbbf9827b05"}, {"source": "security-advisories@github.com", "url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-j77w-h625-56q2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-302"}, {"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.21.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "postiz-app", "source": "cna", "vendor": "gitroomhq"}, "product": "postiz-app", "vendor": "gitroomhq"}], "created": "2026-06-17T04:15:02.645103+00:00", "updated": "2026-06-17T19:30:11.228660+00:00", "vendors": ["gitroomhq", "gitroomhq$PRODUCT$postiz-app"]}