{"action":"Upgrade concrete5/concrete5 to 9.5.1 or later.","affected":[{"fixed":"9.5.1","introduced":"0"}],"component":"concrete5/concrete5","cve_ids":["CVE-2026-8421"],"ecosystem":"Packagist","epss":0.00171,"exploited":false,"fixed_versions":["9.5.1"],"ghsa_id":"GHSA-4c8m-6fwx-m7xq","id":"tcs_01M5KETWCY1905J1Q43PMTTDVN","modified_at":"2026-09-10T03:51:04.531563052Z","published_at":"2026-05-21T21:30:38Z","references":["https://osv.dev/vulnerability/GHSA-4c8m-6fwx-m7xq","https://nvd.nist.gov/vuln/detail/CVE-2026-8421","https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes","https://github.com/concretecms/concretecms"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"GHSA-4c8m-6fwx-m7xq","url":"https://osv.dev/vulnerability/GHSA-4c8m-6fwx-m7xq"},{"source":"nvd","source_id":"CVE-2026-8421","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8421"}],"summary":"Concrete CMS contains a CSRF vulnerability"}