Security advisory

{
  "id": "125a3fb7f4b13556c372a423943d9d0900e158358cf38a961314aa656e191692",
  "url": "https://osv.dev/vulnerability/CVE-2021-44618",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-44618",
    "summary": "A Server-side Template Injection (SSTI) vulnerability exists in Nystudio107 Seomatic 3.4.12 in src/helpers/UrlHelper.php via the host header.",
    "evidence": "osv:CVE-2021-44618",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-44618",
      "aliases": [
        "CVE-2021-44618",
        "GHSA-m3xv-x3ph-mq22"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nystudio107/craft-seomatic",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9ad5d83ca24fe6f9bd1c4b34c3d60fe38a8dc132"
                },
                {
                  "last_affected": "9ad5d83ca24fe6f9bd1c4b34c3d60fe38a8dc132"
                },
                {
                  "fixed": "0c5c0c0e0cb61000d12ec55ebf174745a5bf6469"
                },
                {
                  "fixed": "9ad5d83ca24fe6f9bd1c4b34c3d60fe38a8dc132"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nystudio107:seomatic:3.4.12:*:*:*:*:craft_cms:*:*",
                    "range": [
                      {
                        "introduced": "3.4.12"
                      },
                      {
                        "last_affected": "3.4.12"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0c5c0c0e0cb61000d12ec55ebf174745a5bf6469"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9ad5d83ca24fe6f9bd1c4b34c3d60fe38a8dc132"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "3.4.12"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.4.12"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44618.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:06.457296060Z",
      "provider": "osv",
      "references": [
        "https://github.com/nystudio107/craft-seomatic/releases/tag/3.4.12",
        "https://github.com/nystudio107/craft-seomatic/commit/0c5c0c0e0cb61000d12ec55ebf174745a5bf6469"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-44618",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386902,
  "published_at": "2022-03-11T16:15:07.523+00:00"
}