---
title: "CVE-2026-53957: Contentful MCP Server - Authentication Bypass"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-53957/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-53957)

## 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](https://cwe.mitre.org/data/definitions/918.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-53957](https://nvd.nist.gov/vuln/detail/CVE-2026-53957)
- [https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0](https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0)
- [https://github.com/contentful/contentful-mcp-server/pull/376](https://github.com/contentful/contentful-mcp-server/pull/376)
- [https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19](https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19)
- [https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5](https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5)
- [https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx](https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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