CVE-2026-45285

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From versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a user shares a folder or file with a Nextcloud Team that includes an external member (a person added via email address who does not have a Nextcloud account), the system automatically creates a public link for that external member. This public link is not displayed in the share section of the folder, so the folder owner has no knowledge of its existence. It is sent via email to the external member. It grants the same permissions (read, write, delete, reshare, download) as the Team\u2019s access. An attacker who receives or intercepts this link can access, modify, delete, reshare, and download all data in the shared folder without any further authentication. The folder owner cannot see or revoke the link through the normal sharing interface. This issue has been patched in versions 32.0.9 and 33.0.3."}, {"lang": "es", "value": "Nextcloud es una plataforma de colaboraci\u00f3n de contenido de c\u00f3digo abierto. Desde las versiones 32.0.0 hasta antes de la 32.0.9, y de la 33.0.0 hasta antes de la 33.0.3, cuando un usuario comparte una carpeta o archivo con un Equipo de Nextcloud que incluye un miembro externo (una persona a\u00f1adida a trav\u00e9s de una direcci\u00f3n de correo electr\u00f3nico que no tiene una cuenta de Nextcloud), el sistema crea autom\u00e1ticamente un enlace p\u00fablico para ese miembro externo. Este enlace p\u00fablico no se muestra en la secci\u00f3n de compartir de la carpeta, por lo que el propietario de la carpeta no tiene conocimiento de su existencia. Se env\u00eda por correo electr\u00f3nico al miembro externo. Otorga los mismos permisos (leer, escribir, eliminar, volver a compartir, descargar) que el acceso del Equipo. Un atacante que recibe o intercepta este enlace puede acceder, modificar, eliminar, volver a compartir y descargar todos los datos de la carpeta compartida sin ninguna autenticaci\u00f3n adicional. El propietario de la carpeta no puede ver ni revocar el enlace a trav\u00e9s de la interfaz de uso compartido normal. Este problema ha sido parcheado en las versiones 32.0.9 y 33.0.3."}], "id": "CVE-2026-45285", "lastModified": "2026-07-22T08:10:00.117", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45285", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-02T12:49:57.366871Z", "version": "2.0.3"}}]}, "published": "2026-06-01T19:16:50.807", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/nextcloud/circles/pull/2454"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r3xh-x86g-hw4m"}, {"source": "security-advisories@github.com", "tags": ["Permissions Required"], "url": "https://hackerone.com/reports/3625932"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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