{"cve":"CVE-2025-66547","nvd":{"published":"2025-12-05T17:16:05.330","modified":"2026-10-18T14:10:00.110","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-639"],"references":["https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2","https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9","https://github.com/nextcloud/server/issues/51247","https://github.com/nextcloud/server/pull/51288","https://hackerone.com/reports/3040887"],"products":["nextcloud:nextcloud_server"],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-66547","score":0.00279,"percentile":0.20144,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}