{"id":"CVE-2021-28145","aliases":["EUVD-2022-2902","GHSA-7388-7vq2-m4f4"],"status":"published","title":"Concrete CMS Cross-site Scripting via Survey Blocks","description":"Concrete CMS (formerly concrete5) before 8.5.5 allows remote authenticated users to conduct XSS attacks via a crafted survey block. This requires at least Editor privileges.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00861,"percentile":0.58779,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2021-03-18T15:44:02Z","modified":"2026-10-24T10:30:47Z","fixes":[{"ecosystem":"Packagist","package":"concrete5/concrete5","fixed_in":["8.5.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"concrete5/concrete5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.5"}]}]},{"source":"osv","ecosystem":"Packagist","package":"concrete5/concrete5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.5"}]}],"versions":["8.0","8.0.1","8.0.2","8.0.3","8.1.0","8.2.0","8.2.0RC2","8.2.1","8.3.0","8.3.1","8.3.2","8.4.0","8.4.0RC3","8.4.0RC4","8.4.1","8.4.2","8.4.3","8.4.4","8.4.5","8.5.0","8.5.0RC1","8.5.0RC2","8.5.1","8.5.2","8.5.3","8.5.4"]}],"products":[{"vendor":"concretecms","product":"concrete_cms"}],"references":[{"url":"https://www.concrete5.org/developers/security","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://documentation.concrete5.org/developers/introduction/version-history/855-release-notes","tags":["x_refsource_CONFIRM","x_transferred","Release Notes","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28145","tags":["advisory"]},{"url":"https://github.com/S1lkys/CVE-2021-40101","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7388-7vq2-m4f4"}],"sources":{"cve":[{"id":"CVE-2021-28145","description":"Concrete CMS (formerly concrete5) before 8.5.5 allows remote authenticated users to conduct XSS attacks via a crafted survey block. 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