{"id":"CVE-2023-28820","aliases":["GHSA-fgxj-g7x3-85cq"],"url":"https://o3.security/vulnerability/CVE-2023-28820","summary":"Stored cross site scripting in RSS displayer","details":"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.","published":"2023-04-28T00:00:00Z","modified":"2026-08-12T03:51:45.514815779Z","cvss":{"score":2,"severity":"LOW","vector":"CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R"},"epss":{"score":0.00393,"percentile":0.33154,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"concrete5/concrete5","fixedVersion":"9.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28820.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28820"},{"type":"ADVISORY","url":"https://www.concretecms.org/about/project-news/security/concrete-cms-security-advisory-2023-04-20"},{"type":"PACKAGE","url":"https://github.com/concretecms/concretecms/releases"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:45.514815779Z"}}