HIGH

CVE-2026-53957

Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint

CVSS v3

7.7

HIGH

EPSS Score

0.4 %

exploit probability, as of 2026-09-28

CISA KEV

known exploited

Exploitation

—

SSVC status

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_MANA

Technical details

Published: 2026-09-15
Last Modified: 2026-09-15

Frequently asked questions

What is CVE-2026-53957?

Is CVE-2026-53957 actively exploited?

Active exploitation of CVE-2026-53957 has not been confirmed. Its EPSS score was 0.4% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-53957?

CVE-2026-53957 has a CVSS v3 base score of 7.7 (HIGH severity).

Is CVE-2026-53957 affecting your environment?

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