CVE-2026-53957 Contentful MCP Server - Authentication Bypass

Contentful MCP Server < 1.7.19 and MCP Tools < 0.4.5 contain an authorization token exposure caused by unvalidated host and proxy options in space migration tools, letting attackers redirect API requests and access tokens, exploit requires enabling migration tools and attacker-controlled content.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.41% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-918

Vendor fix

Update to @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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