{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-66546","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2025-12-04T15:52:26.549Z","datePublished":"2025-12-05T16:49:46.553Z","dateUpdated":"2025-12-05T18:32:44.271Z"},"containers":{"cna":{"title":"Nextcloud Calendar app allowed booking appointments without the generated token","problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":3.3,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95"},{"name":"https://github.com/nextcloud/calendar/pull/7537","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/pull/7537"},{"name":"https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3"},{"name":"https://hackerone.com/reports/3275810","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3275810"}],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":">= 6.0.0-rc.1, < 6.0.1","status":"affected"},{"version":">= 5.0.0-rc.1, < 5.5.6","status":"affected"},{"version":">= 3.0.0-beta1, < 4.7.19","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2025-12-05T16:49:46.553Z"},"descriptions":[{"lang":"en","value":"Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1."}],"source":{"advisory":"GHSA-7x2j-2674-fj95","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-12-05T18:32:11.684776Z","id":"CVE-2025-66546","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-12-05T18:32:44.271Z"}}]}}