{"id":"CVE-2021-40108","aliases":["EUVD-2021-27297","GHSA-9jj7-ch3r-h65g"],"status":"published","title":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF....","description":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/dialogs/event/add/save endpoint.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00499,"percentile":0.43315,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-352"],"published":"2021-09-27T12:01:34Z","modified":"2026-10-24T10:30:35Z","products":[{"vendor":"concretecms","product":"concrete_cms"}],"references":[{"url":"https://hackerone.com/reports/1102018","tags":["x_refsource_MISC","x_transferred","Permissions Required","report"]},{"url":"https://documentation.concretecms.org/developers/introduction/version-history/856-release-notes","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40108"},{"url":"https://github.com/advisories/GHSA-9jj7-ch3r-h65g"}],"sources":{"cve":[{"id":"CVE-2021-40108","description":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/dialogs/event/add/save endpoint.","status":"published","published":"2021-09-27T12:01:34Z","modified":"2024-08-04T02:27:31.845Z","updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27297","description":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/dialogs/event/add/save endpoint.","status":"published","published":"2021-09-27T12:01:34Z","modified":"2024-08-04T02:27:31Z","updated_at":"2026-11-03T03:24:21.368958Z"}],"ghsa":[{"id":"GHSA-9jj7-ch3r-h65g","title":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF....","description":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/dialogs/event/add/save endpoint.","status":"published","published":"2022-05-24T19:15:51Z","modified":"2023-01-30T05:02:29Z","cwes":["CWE-352"],"updated_at":"2026-11-02T14:46:38.945282Z"}],"nvd":[{"id":"CVE-2021-40108","description":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/dialogs/event/add/save endpoint.","status":"published","published":"2021-09-27T13:15:08.063Z","modified":"2026-06-17T04:06:32.08Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-352"],"updated_at":"2026-11-02T14:06:58.933037Z"}],"osv":[{"id":"CVE-2021-40108","description":"An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/dialogs/event/add/save endpoint.","status":"published","published":"2021-09-27T13:15:08.063Z","modified":"2026-10-24T10:30:35.335580138Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:21.249056Z"}]}}