CVE-2026-53957

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