Craft CMS has a host header injection leading to SSRF via resource-js endpoint

{
  "id": "9ff40dea2e267eed248611dc698e93e14d839490c3924593772d48a90bae15dd",
  "url": "https://osv.dev/vulnerability/CVE-2026-41130",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Craft CMS has a host header injection leading to SSRF via resource-js endpoint",
    "summary": "Craft CMS is a content management system (CMS). In versions on the 4.x branch through 4.17.8 and the 5.x branch through 5.9.14, the `resource-js` endpoint in Craft CMS allows unauthenticated requests to proxy remote JavaScript resources. When `trustedHosts` is not explicitly restricted (default configuration), the application trusts the client-supplied Host header. This allows an attacker to control the derived `baseUrl`, which is used in prefix validation inside `actionResourceJs()`. By supplying a malicious Host header, the attacker can make the server issue arbitrary HTTP requests, leading to Server-Side Request Forgery (SSRF). Versions 4.17.9 and 5.9.15 patch the issue.",
    "evidence": "osv:CVE-2026-41130",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-41130",
      "aliases": [
        "CVE-2026-41130",
        "GHSA-95wr-3f2v-v2wh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/craftcms/cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "04755d93f86d07cc183db47db8a0eee106892e30"
                },
                {
                  "fixed": "84d783586bf0abf619a9d1909d93fdfdcaaf73a4"
                },
                {
                  "introduced": "daac7c1da2f701f2e9ddee1da1457ce61660b581"
                },
                {
                  "fixed": "ade6b5b843c82df6ac1661c453f1812294bdbef7"
                },
                {
                  "fixed": "ebe7e85f1c89700d64332f72492be2e9a594e783"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0.0-RC1"
                      },
                      {
                        "fixed": "5.9.15"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "4.0.0-RC1"
                      },
                      {
                        "fixed": "4.17.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ebe7e85f1c89700d64332f72492be2e9a594e783"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41130.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.202080337Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41130.json",
        "https://github.com/craftcms/cms/security/advisories/GHSA-95wr-3f2v-v2wh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41130",
        "https://github.com/craftcms/cms/commit/ebe7e85f1c89700d64332f72492be2e9a594e783"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41130.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41130",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494775,
  "published_at": "2026-04-21T23:36:31.358+00:00"
}