# CVE-2026-53957

## Summary

- **CVE ID:** CVE-2026-53957
- **Severity:** HIGH
- **CVSS Score:** 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)
- **CWE:** CWE-918
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- contentful — contentful-mcp-server (< 1.7.19)
- @contentful — mcp-server (< 1.7.19)
- @contentful — mcp-tools (< 0.4.5)

## References

- [CNA](https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx)
- [CNA](https://github.com/contentful/contentful-mcp-server/pull/376)
- [CNA](https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0)
- [CNA](https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19)
- [CNA](https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._