{"id":"CVE-2025-66547","summary":"Nextcloud Server users can modify tags on files that do not belong to them","details":"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.","aliases":["GHSA-hq6c-r898-fgf2"],"modified":"2026-04-02T13:02:21.622144Z","published":"2025-12-05T16:32:17.359Z","database_specific":{"cwe_ids":["CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66547.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://hackerone.com/reports/3040887"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66547.json"},{"type":"ADVISORY","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66547"},{"type":"REPORT","url":"https://github.com/nextcloud/server/issues/51247"},{"type":"FIX","url":"https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9"},{"type":"FIX","url":"https://github.com/nextcloud/server/pull/51288"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nextcloud/server","events":[{"introduced":"051e46a7a272300cf7c90b3e330fd1501fd6a996"},{"fixed":"ca86133382c6efb7c0eb82e5b9806a84bad2b9dc"}]}],"versions":["v31.0.0","v31.0.1rc1","v31.0.1rc2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66547.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}