CVE-2026-45282

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In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authenticated attacker can access attachments of link shares when knowing the share token, circumventing password protection or download restrictions. It is applicable to any file that is shared directly, as the attacker only needs to know a documentId they own, apart of the mentioned share token. For shared folders the attacker has to know or guess a documentId of a file that is included inside the folder, making it much harder to exploit. The attacker can only extract an attachments, but not the file shared file or folder itself. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, 29.0.16.16, 28.0.14.17 or 27.1.11.5"}, {"lang": "es", "value": "Nextcloud es una plataforma de colaboraci\u00f3n de contenido de c\u00f3digo abierto. En Nextcloud Server desde las versiones 32.0.0 hasta antes de la 32.0.9, y 33.0.0 hasta antes de la 33.0.3, un atacante autenticado puede acceder a los archivos adjuntos de los enlaces compartidos al conocer el token de compartici\u00f3n, eludiendo la protecci\u00f3n por contrase\u00f1a o las restricciones de descarga. Es aplicable a cualquier archivo que se comparta directamente, ya que el atacante solo necesita conocer un documentId de su propiedad, adem\u00e1s del token de compartici\u00f3n mencionado. Para las carpetas compartidas, el atacante tiene que conocer o adivinar un documentId de un archivo que est\u00e9 incluido dentro de la carpeta, lo que hace que sea mucho m\u00e1s dif\u00edcil de explotar. El atacante solo puede extraer un archivo adjunto, pero no el archivo o la carpeta compartida en s\u00ed. Se recomienda que el Nextcloud Server se actualice a la versi\u00f3n 33.0.3 o 32.0.9. Se recomienda que el Nextcloud Enterprise Server se actualice a la versi\u00f3n 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, 29.0.16.16, 28.0.14.17 o 27.1.11.5."}], "id": "CVE-2026-45282", "lastModified": "2026-07-22T07:10:00.107", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45282", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-01T19:28:33.016749Z", "version": "2.0.3"}}]}, "published": "2026-06-01T19:16:50.370", "references": [{"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-35fx-69q6-xpjr"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/nextcloud/text/pull/8499"}, {"source": "security-advisories@github.com", "tags": ["Permissions Required"], "url": "https://hackerone.com/reports/3577244"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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