Security advisory

{
  "id": "b2a015d03dac5a63dc1612818f40081f185e8fdce121b04ea88b58ef3e51b272",
  "url": "https://osv.dev/vulnerability/CVE-2021-41750",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41750",
    "summary": "A cross-site scripting (XSS) vulnerability in the SEOmatic plugin 3.4.10 for Craft CMS 3 allows remote attackers to inject arbitrary web script via a GET to /index.php?action=seomatic/file/seo-file-link with url parameter containing the base64 encoded URL of a malicious web page / file and fileName parameter containing an arbitrary filename with the intended content-type to be rendered in the user's browser as the extension.",
    "evidence": "osv:CVE-2021-41750",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-41750",
      "aliases": [
        "CVE-2021-41750",
        "GHSA-6hjc-m38h-7jhh"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nystudio107/craft-seomatic",
              "type": "GIT",
              "events": [
                {
                  "introduced": "21fd6077413ce82fcd0971a7524e027a7bb51e73"
                },
                {
                  "last_affected": "21fd6077413ce82fcd0971a7524e027a7bb51e73"
                },
                {
                  "fixed": "4e46b792ce973ac0c652fb330055f41aca1981c8"
                },
                {
                  "fixed": "5f2cdc7c39e0a4bfb60d2f84131508f0a87b2873"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nystudio107:seomatic:3.4.10:*:*:*:*:craft_cms:*:*",
                    "range": [
                      {
                        "introduced": "3.4.10"
                      },
                      {
                        "last_affected": "3.4.10"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4e46b792ce973ac0c652fb330055f41aca1981c8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5f2cdc7c39e0a4bfb60d2f84131508f0a87b2873"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.4.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41750.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:58.976307437Z",
      "provider": "osv",
      "references": [
        "https://github.com/nystudio107/craft-seomatic/blob/develop/CHANGELOG.md",
        "https://github.com/nystudio107/craft-seomatic/commit/4e46b792ce973ac0c652fb330055f41aca1981c8",
        "https://github.com/nystudio107/craft-seomatic/commit/5f2cdc7c39e0a4bfb60d2f84131508f0a87b2873"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41750",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386627,
  "published_at": "2022-06-12T12:15:07.91+00:00"
}