Description

Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access restriction and expose arbitrary local file contents in the MCP client application context. To remediate this issue, users should upgrade to version 1.3.9.

INFO

Published Date :

2026-03-16T16:07:53.324Z

Last Modified :

2026-03-16T18:17:17.927Z

Source :

AMZN
AFFECTED PRODUCTS

The following products are affected by CVE-2026-4270 vulnerability.

Vendors Products
Aws
  • Aws Api Mcp Server
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4270.

URL Resource
https://aws.amazon.com/security/security-bulletins/2026-007-AWS/ cve-icon cve-icon
https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9/ cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact