{"id":"CVE-2021-44618","aliases":["GHSA-m3xv-x3ph-mq22"],"url":"https://o3.security/vulnerability/CVE-2021-44618","summary":"Server-side Template Injection in nystudio107/craft-seomatic","details":"A Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic 3.4.12 in src/helpers/UrlHelper.php via the host header.","published":"2022-03-11T16:15:07.523Z","modified":"2026-07-09T05:45:38.089348Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"nystudio107/craft-seomatic","fixedVersion":"3.4.12"}],"fix":{"url":"https://github.com/nystudio107/craft-seomatic/commit/0c5c0c0e0cb61000d12ec55ebf174745a5bf6469","label":"nystudio107/craft-seomatic@0c5c0c0"},"references":[{"type":"ADVISORY","url":"https://github.com/nystudio107/craft-seomatic/releases/tag/3.4.12"},{"type":"FIX","url":"https://github.com/nystudio107/craft-seomatic/commit/0c5c0c0e0cb61000d12ec55ebf174745a5bf6469"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T05:45:38.089348Z"}}