{"id":"CVE-2026-53957","state":"PUBLISHED","title":"Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint","description":"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.","publishedAt":"2026-09-15T14:34:53.699Z","updatedAt":"2026-09-17T14:32:11.722Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["contentful contentful-mcp-server","@contentful mcp-server","@contentful mcp-tools"],"affected":[{"vendor":"contentful","product":"contentful-mcp-server","versions":[{"version":"< 1.7.19","status":"affected"}]},{"vendor":"@contentful","product":"mcp-server","versions":[{"version":"< 1.7.19","status":"affected"}]},{"vendor":"@contentful","product":"mcp-tools","versions":[{"version":"< 0.4.5","status":"affected"}]}],"references":["https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx","https://github.com/contentful/contentful-mcp-server/pull/376","https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0","https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19","https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53957.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53957","state":"PUBLISHED","datePublished":"2026-09-15T14:34:53.699Z","dateUpdated":"2026-09-17T14:32:11.722Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-11T15:50:01.282Z"},"containers":{"cna":{"title":"Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"contentful","product":"contentful-mcp-server","versions":[{"version":"< 1.7.19","status":"affected"}]},{"vendor":"@contentful","product":"mcp-server","versions":[{"version":"< 1.7.19","status":"affected"}]},{"vendor":"@contentful","product":"mcp-tools","versions":[{"version":"< 0.4.5","status":"affected"}]}],"references":[{"url":"https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx","name":"https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/contentful/contentful-mcp-server/pull/376","name":"https://github.com/contentful/contentful-mcp-server/pull/376","tags":["x_refsource_MISC"]},{"url":"https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0","name":"https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0","tags":["x_refsource_MISC"]},{"url":"https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19","name":"https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19","tags":["x_refsource_MISC"]},{"url":"https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5","name":"https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-15T14:34:53.699Z"},"source":{"advisory":"GHSA-2xhg-73j7-rrgx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T14:31:40.554851Z","id":"CVE-2026-53957","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-17T14:32:11.722Z"}}]}}}