{
  "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-2023-35927",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-35927",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2023-06-23T20:53:33.688Z",
    "updatedAt": "2024-11-07T18:29:35.811Z",
    "importedAt": "2026-10-24T01:56:53.804Z",
    "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 system addressbooks can be modified by malicious trusted server",
      "summary": "NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, when two server are registered as trusted servers for each other and successfully exchanged the share secrets, the malicious server could modify or delete VCards in the system addressbook on the origin server. This would impact the available and shown information in certain places, such as the user search and avatar menu. If a manipulated user modifies their own data in the personal settings the entry is fixed again.\n\nNextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. A workaround is available. Remove all trusted servers in the \"Administration\" > \"Sharing\" settings `…/index.php/settings/admin/sharing`. Afterwards, trigger a recreation of the local system addressbook with the following `occ dav:sync-system-addressbook`.",
      "affected": [
        {
          "vendor": "nextcloud",
          "product": "security-advisories",
          "versions": [
            {
              "version": "Nextcloud Server >= 25.0.0, < 25.0.7",
              "status": "affected"
            },
            {
              "version": "Nextcloud Server >= 26.0.0, < 26.0.2",
              "status": "affected"
            },
            {
              "version": "Nextcloud Enterprise Server >= 25.0.0, < 25.0.7",
              "status": "affected"
            },
            {
              "version": "Nextcloud Enterprise Server >= 26.0.0, < 26.0.2",
              "status": "affected"
            },
            {
              "version": "Nextcloud Enterprise Server >= 21.0.0, < 21.0.9.12",
              "status": "affected"
            },
            {
              "version": "Nextcloud Enterprise Server >= 22.0.0, < 22.2.10.12",
              "status": "affected"
            },
            {
              "version": "Nextcloud Enterprise Server >= 23.0.0, < 23.0.12.7",
              "status": "affected"
            },
            {
              "version": "Nextcloud Enterprise Server >= 24.0.0, < 24.0.12.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}