{"id":"CVE-2025-66547","state":"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.","publishedAt":"2025-12-05T16:32:17.359Z","updatedAt":"2025-12-05T18:20:43.503Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["nextcloud security-advisories"],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":"< 31.0.1","status":"affected"}]}],"references":["https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2","https://github.com/nextcloud/server/issues/51247","https://github.com/nextcloud/server/pull/51288","https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9","https://hackerone.com/reports/3040887"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/66xxx/CVE-2025-66547.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-66547","state":"PUBLISHED","datePublished":"2025-12-05T16:32:17.359Z","dateUpdated":"2025-12-05T18:20:43.503Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-12-04T15:52:26.550Z"},"containers":{"cna":{"title":"Nextcloud Server users can modify tags on files that do not belong to them","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":"< 31.0.1","status":"affected"}]}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2","name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nextcloud/server/issues/51247","name":"https://github.com/nextcloud/server/issues/51247","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextcloud/server/pull/51288","name":"https://github.com/nextcloud/server/pull/51288","tags":["x_refsource_MISC"]},{"url":"https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9","name":"https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9","tags":["x_refsource_MISC"]},{"url":"https://hackerone.com/reports/3040887","name":"https://hackerone.com/reports/3040887","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-12-05T16:32:17.359Z"},"source":{"advisory":"GHSA-hq6c-r898-fgf2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-12-05T18:20:11.023676Z","id":"CVE-2025-66547","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-12-05T18:20:43.503Z"}}]}}}