{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.7.19"
              },
              {
                "fixed": "0.4.5"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fa7477ee48515f4248bc91a025eab0ca83423fe0"
            },
            {
              "fixed": "ce904443ae38dfeaeadf305591c95b800e782570"
            }
          ],
          "repo": "https://github.com/contentful/contentful-mcp-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2xhg-73j7-rrgx"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53957.json"
  },
  "details": "Contentful MCP Server is a Model Context Protocol server for the Contentful Management API. Prior to @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5, export_space and import_space in packages/mcp-tools/src/tools/jobs/space-to-space-migration/exportSpace.ts and packages/mcp-tools/src/tools/jobs/space-to-space-migration/importSpace.ts expose host, proxy, rawProxy, and insecure network options to LLM-controlled tool arguments and combine those options with the server's CONTENTFUL_MANAGEMENT_TOKEN. After space_to_space_migration_handler enables the migration tools, a direct MCP call or prompt injection through attacker-controlled Contentful content can redirect Contentful Management API requests and their Authorization header to an attacker-controlled host or proxy. The regular tools that use createToolClient are unaffected because those tools pin the host from server configuration. Exposure of the personal access token permits persistent out-of-band access to every Contentful space within the token's scope. This issue is fixed in @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5.",
  "id": "CVE-2026-53957",
  "modified": "2026-09-19T03:30:52.651698290Z",
  "published": "2026-09-15T14:34:53.699Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19"
    },
    {
      "type": "WEB",
      "url": "https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53957.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53957"
    },
    {
      "type": "FIX",
      "url": "https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/contentful/contentful-mcp-server/pull/376"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint"
}