{"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"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-66546", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-12-05T18:32:11.684776Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-12-05T18:32:34.528Z"}}], "cna": {"title": "Nextcloud Calendar app allowed booking appointments without the generated token", "source": {"advisory": "GHSA-7x2j-2674-fj95", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.3, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "nextcloud", "product": "security-advisories", "versions": [{"status": "affected", "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"}]}], "references": [{"url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95", "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/nextcloud/calendar/pull/7537", "name": "https://github.com/nextcloud/calendar/pull/7537", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3", "name": "https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3", "tags": ["x_refsource_MISC"]}, {"url": "https://hackerone.com/reports/3275810", "name": "https://hackerone.com/reports/3275810", "tags": ["x_refsource_MISC"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-639", "description": "CWE-639: Authorization Bypass Through User-Controlled Key"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2025-12-05T16:49:46.553Z"}}}, "cveMetadata": {"cveId": "CVE-2025-66546", "state": "PUBLISHED", "dateUpdated": "2025-12-05T18:32:44.271Z", "dateReserved": "2025-12-04T15:52:26.549Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2025-12-05T16:49:46.553Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*", "matchCriteriaId": "84E1FFC4-516D-4680-9F67-E66C1FAE5E0B", "versionEndExcluding": "4.7.19", "versionStartIncluding": "4.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*", "matchCriteriaId": "3E716F13-981B-49BA-98FF-3B52C9962EA2", "versionEndExcluding": "5.5.6", "versionStartIncluding": "5.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:-:*:*:*:*:*:*", "matchCriteriaId": "5FEEB806-FB4C-42B4-BE4E-297AB95A854F", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1A878DF-8A9B-4987-8E2C-6873CA2C8427", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "9B9884CA-4E88-4AB3-BA37-FAF9E845F04E", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "032400B7-AE78-467F-81CC-83164AC29796", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "D1A265F6-884F-44FF-B00F-CB5F7E704E0E", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "8249ACE0-0485-4485-B628-D157E57A91C0", "vulnerable": true}, {"criteria": "cpe:2.3:a:nextcloud:calendar:6.0.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "508556C9-5596-42B5-AD76-8156A42FEED7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2025-66546", "lastModified": "2025-12-09T16:36:01.357", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2025-12-05T17:16:05.163", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/nextcloud/calendar/pull/7537"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://hackerone.com/reports/3275810"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}