{"action":"Upgrade concrete5/concrete5 to 9.5.1 or later.","affected":[{"fixed":"9.5.1","introduced":"0"}],"component":"concrete5/concrete5","cve_ids":["CVE-2026-8204"],"ecosystem":"Packagist","epss":0.00211,"exploited":false,"fixed_versions":["9.5.1"],"ghsa_id":"GHSA-x2fp-hj8c-mmxh","id":"tcs_01M5KFAH29MAT1BF0A6Z3TBMHG","modified_at":"2026-09-10T03:50:48.018904818Z","published_at":"2026-05-21T21:30:38Z","references":["https://osv.dev/vulnerability/GHSA-x2fp-hj8c-mmxh","https://nvd.nist.gov/vuln/detail/CVE-2026-8204","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-x2fp-hj8c-mmxh","url":"https://osv.dev/vulnerability/GHSA-x2fp-hj8c-mmxh"}],"summary":"Concrete CMS is vulnerable to authorization bypass in the Calendar Event Frontend Dialog"}