{"id":"BIT-nextcloud-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":["CVE-2025-66547","GHSA-hq6c-r898-fgf2"],"modified":"2026-09-08T08:48:16.761692423Z","published":"2026-07-12T23:47:57.830Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2"},{"type":"FIX","url":"https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9"},{"type":"REPORT","url":"https://github.com/nextcloud/server/issues/51247"},{"type":"REPORT","url":"https://github.com/nextcloud/server/pull/51288"},{"type":"ADVISORY","url":"https://hackerone.com/reports/3040887"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66547"}],"affected":[{"package":{"name":"nextcloud","ecosystem":"Bitnami","purl":"pkg:bitnami/nextcloud"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"31.0.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/nextcloud/BIT-nextcloud-2025-66547.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}],"schema_version":"1.9.0"}