Ghost: Server-Side Request Forgery Mitigation Issue

{
  "id": "4bc6aa3beb294e8832f2f3ba908623fcf324b1538dc02cdebdf38a160f9fbc4c",
  "url": "https://osv.dev/vulnerability/CVE-2026-70595",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Ghost: Server-Side Request Forgery Mitigation Issue",
    "summary": "Ghost is a Node.js content management system. From 6.26.0 until 6.54.1, a validation issue allowed some functionality, such as Webmentions, to be abused by an unauthenticated user to make limited HTTP requests to hosts in the Ghost server's internal network. A successful attack would not result in any response data being returned. This vulnerability is fixed in 6.54.1.",
    "evidence": "osv:CVE-2026-70595",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-70595",
      "aliases": [
        "BIT-ghost-2026-70595",
        "CVE-2026-70595",
        "GHSA-x5mm-wm4g-j5xv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tryghost/ghost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "dc55b8cd752d6f0f08bcd81d935f26366d1c26a3"
                },
                {
                  "fixed": "94e25d9de158bc10b6a74d9aad75944b1a68ee13"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "6.26.0"
                      },
                      {
                        "fixed": "6.54.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.54.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.54.0",
            "v6.53.0",
            "v6.52.1",
            "v6.52.0",
            "v6.51.0",
            "v6.50.0",
            "v6.49.0",
            "v6.48.0",
            "v6.47.0",
            "v6.46.0",
            "v6.45.0",
            "v6.44.1",
            "v6.44.0",
            "v6.43.1",
            "v6.43.0",
            "v6.42.0",
            "v6.41.1",
            "v6.41.0",
            "v6.40.0",
            "v6.39.0",
            "v6.38.0",
            "v6.37.1",
            "v6.37.0",
            "v6.36.0",
            "v6.35.0",
            "v6.34.0",
            "v6.33.0",
            "v6.32.0",
            "v6.31.0",
            "v6.30.0",
            "v6.29.1",
            "v6.29.0",
            "v6.28.0",
            "v6.27.0",
            "v6.26.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70595.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.300214002Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70595.json",
        "https://github.com/TryGhost/Ghost/security/advisories/GHSA-x5mm-wm4g-j5xv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-70595"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70595.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-70595",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492087,
  "published_at": "2026-08-05T14:37:21.119+00:00"
}