PT-2026-25773 · Aws · Aws Api Mcp Server

Published 2026-03-16 · Updated 2026-03-16 · CVE-2026-4270

Mitre

CVSS v3.1

5.5

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

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.

Fix

Weakness Enumeration

CWE-424

Related Identifiers

CVE-2026-4270

Affected Products

Aws Api Mcp Server

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-4270 · Security Note
• https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9 · Patch
• https://aws.amazon.com/security/security-bulletins/2026-007-AWS · Vendor Advisory