{"id":"CVE-2021-28145","aliases":["GHSA-7388-7vq2-m4f4"],"url":"https://o3.security/vulnerability/CVE-2021-28145","summary":"Concrete CMS Cross-site Scripting via Survey Blocks","details":"Concrete CMS (formerly concrete5) before 8.5.5 allows remote authenticated users to conduct Cross-site Scripting (XSS) attacks via a crafted survey block. This requires at least Editor privileges.","published":"2021-03-18T16:15:14.717Z","modified":"2026-07-09T00:13:27.681498Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00861,"percentile":0.55367,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"concrete5/concrete5","fixedVersion":"8.5.5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://documentation.concrete5.org/developers/introduction/version-history/855-release-notes"},{"type":"ADVISORY","url":"https://www.concrete5.org/developers/security"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28145"},{"type":"WEB","url":"https://github.com/S1lkys/CVE-2021-40101"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T00:13:27.681498Z"}}