{"id":"CVE-2023-28820","aliases":["EUVD-2023-1289","GHSA-fgxj-g7x3-85cq"],"status":"published","title":"Stored cross site scripting in RSS displayer","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","severity":{"version":"3.1","score":2,"vector":"CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00393,"percentile":0.3382,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2023-04-28T00:00:00Z","modified":"2026-10-28T02:30:50Z","fixes":[{"ecosystem":"Packagist","package":"concrete5/concrete5","fixed_in":["9.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"concrete5/concrete5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.1.0"}]}]},{"source":"osv","ecosystem":"Packagist","package":"concrete5/concrete5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.1.0"}]}],"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","8.5.10","8.5.11","8.5.12","8.5.13","8.5.14","8.5.15","8.5.16","8.5.17","8.5.18","8.5.19","8.5.2","8.5.20","8.5.21","8.5.3","8.5.4","8.5.5","8.5.6","8.5.6RC1","8.5.7","8.5.8","8.5.9","9.0.0","9.0.0RC1","9.0.0RC3","9.0.0RC4","9.0.1","9.0.2"]}],"products":[{"vendor":"concretecms","product":"concrete_cms"}],"references":[{"url":"https://github.com/concretecms/concretecms/releases","tags":["x_transferred","Release Notes","package","web"]},{"url":"https://www.concretecms.org/about/project-news/security/concrete-cms-security-advisory-2023-04-20","tags":["x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28820","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-fgxj-g7x3-85cq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28820.json","tags":["advisory"]},{"url":"https://github.com/concretecms/concretecms","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-28820","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","status":"published","published":"2023-04-28T00:00:00Z","modified":"2025-01-31T16:09:34.124Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R","level":"low","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:35:32.752775Z"}],"euvd":[{"id":"EUVD-2023-1289","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","status":"published","published":"2023-04-28T00:00:00Z","modified":"2025-01-31T16:09:34Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R","level":"low"}],"updated_at":"2026-11-03T00:04:08.172652Z"}],"ghsa":[{"id":"GHSA-fgxj-g7x3-85cq","title":"Stored cross site scripting in RSS displayer","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","status":"published","published":"2023-04-28T15:30:19Z","modified":"2023-11-07T05:06:50Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:37:15.931647Z"}],"nvd":[{"id":"CVE-2023-28820","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","status":"published","published":"2023-04-28T14:15:10.703Z","modified":"2026-06-17T05:48:50.42Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"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"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:07:59.151142Z"}],"osv":[{"id":"CVE-2023-28820","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","status":"published","published":"2023-04-28T00:00:00Z","modified":"2026-10-28T02:30:50.001827138Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R","level":"low"}],"updated_at":"2026-11-02T15:44:31.468318Z"},{"id":"GHSA-fgxj-g7x3-85cq","title":"Stored cross site scripting in RSS displayer","description":"Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.","status":"published","published":"2023-04-28T15:30:19Z","modified":"2026-09-10T03:50:00.793662293Z","cvss":[{"version":"3.1","score":2,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:46.39441Z"}]}}