{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-48239",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-48239",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2023-11-21T21:02:35.442Z",
    "updatedAt": "2025-06-10T13:59:10.422Z",
    "importedAt": "2026-10-24T01:56:58.683Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Nextcloud Server users can make external storage mount points inaccessible for other users",
      "summary": "Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.",
      "affected": [
        {
          "vendor": "nextcloud",
          "product": "security-advisories",
          "versions": [
            {
              "version": ">= 25.0.0, < 25.0.13",
              "status": "affected"
            },
            {
              "version": ">= 26.0.0, < 26.0.8",
              "status": "affected"
            },
            {
              "version": ">= 27.0.0, < 27.1.3",
              "status": "affected"
            },
            {
              "version": ">= 20.0.0, < 20.0.14.16",
              "status": "affected"
            },
            {
              "version": ">= 21.0.0, < 21.0.9.13",
              "status": "affected"
            },
            {
              "version": ">= 22.0.0, < 22.2.10.15",
              "status": "affected"
            },
            {
              "version": ">= 23.0.0, < 23.0.12.12",
              "status": "affected"
            },
            {
              "version": ">= 24.0.0, < 24.0.12.8",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}