CVE-2026-53957: @contentful Mcp-Server

High severity, CVSS 7.7. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• @contentful Mcp-Server: before 1.7.19 (fixed in 1.7.19)
• @contentful Mcp-Tools: before 0.4.5 (fixed in 0.4.5)
• Contentful Contentful-Mcp-Server: before 1.7.19 (fixed in 1.7.19)

Published 2026-09-15. Last modified 2026-09-30.