{"action":"Upgrade concrete5/concrete5 to 9.5.1 or later.","affected":[{"fixed":"9.5.1","introduced":"0"}],"component":"concrete5/concrete5","cve_ids":["CVE-2026-8205"],"ecosystem":"Packagist","epss":0.00211,"exploited":false,"fixed_versions":["9.5.1"],"ghsa_id":"GHSA-46xh-7854-f568","id":"tcs_01M5KETR3A8N5XF92JYJ5WH6Z5","modified_at":"2026-09-10T03:51:04.473679134Z","published_at":"2026-05-21T21:30:38Z","references":["https://osv.dev/vulnerability/GHSA-46xh-7854-f568","https://nvd.nist.gov/vuln/detail/CVE-2026-8205","https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes","https://github.com/concretecms/concretecms"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-46xh-7854-f568","url":"https://osv.dev/vulnerability/GHSA-46xh-7854-f568"}],"summary":"Concrete CMS is vulnerable to authorization bypass in the Calendar Block"}