{"id":"CVE-2026-53957","sourceIdentifier":"security-advisories@github.com","published":"2026-09-15T15:17:17.367","lastModified":"2026-09-30T17:51:56.193","vulnStatus":"Deferred","cveTags":[],"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":[{"source":"security-advisories@github.com","affectedData":[{"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"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","baseScore":7.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.1,"impactScore":4.0}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-17T14:31:40.554851Z","id":"CVE-2026-53957","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-918"}]}],"references":[{"url":"https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0","source":"security-advisories@github.com"},{"url":"https://github.com/contentful/contentful-mcp-server/pull/376","source":"security-advisories@github.com"},{"url":"https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19","source":"security-advisories@github.com"},{"url":"https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5","source":"security-advisories@github.com"},{"url":"https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx","source":"security-advisories@github.com"},{"url":"https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}