CVE-2026-53957

Vulnerability 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.

CVSS Score

Related Weaknesses (CWE)

References

• https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc9
• https://github.com/contentful/contentful-mcp-server/pull/376
• https://github.com/contentful/contentful-mcp-server/releases/tag/[email protected].
• https://github.com/contentful/contentful-mcp-server/releases/tag/[email protected]
• https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xh
• https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xh