{"id":"CVE-2025-66547","aliases":["BIT-nextcloud-2025-66547","EUVD-2025-201447","GHSA-hq6c-r898-fgf2"],"status":"published","title":"Nextcloud Server users can modify tags on files that do not belong to them","description":"Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00299,"percentile":0.22749,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-639"],"published":"2025-12-05T16:32:17Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"Bitnami","package":"nextcloud","fixed_in":["31.0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"nextcloud","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"31.0.1"}]}]}],"products":[{"vendor":"kiteworks","product":"security-advisories"},{"vendor":"nextcloud","product":"nextcloud_server"},{"vendor":"nextcloud","product":"security-advisories"}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2","tags":["x_refsource_CONFIRM","Patch","Vendor Advisory","advisory"]},{"url":"https://github.com/nextcloud/server/issues/51247","tags":["x_refsource_MISC","Issue Tracking","report"]},{"url":"https://github.com/nextcloud/server/pull/51288","tags":["x_refsource_MISC","Issue Tracking","report","fix"]},{"url":"https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://hackerone.com/reports/3040887","tags":["x_refsource_MISC","Permissions Required","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66547","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66547.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-66547","title":"Nextcloud Server users can modify tags on files that do not belong to them","description":"Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.","status":"published","published":"2025-12-05T16:32:17.359Z","modified":"2025-12-05T18:20:43.503Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:32:52.839698Z"}],"euvd":[{"id":"EUVD-2025-201447","description":"Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.","status":"published","published":"2025-12-05T16:32:17Z","modified":"2025-12-05T18:20:43Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:49:09.437744Z"}],"nvd":[{"id":"CVE-2025-66547","description":"Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.","status":"published","published":"2025-12-05T17:16:05.33Z","modified":"2026-10-18T14:10:00.11Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:11:49.093461Z"}],"osv":[{"id":"CVE-2025-66547","title":"Nextcloud Server users can modify tags on files that do not belong to them","description":"Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.","status":"published","published":"2025-12-05T16:32:17.359Z","modified":"2026-10-28T02:30:57.043465148Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T15:44:52.202386Z"},{"id":"BIT-nextcloud-2025-66547","title":"Nextcloud Server users can modify tags on files that do not belong to them","description":"Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.","status":"published","published":"2026-07-12T23:47:57.83Z","modified":"2026-09-08T08:48:16.761692423Z","updated_at":"2026-11-02T15:28:34.007508Z"}]}}