CVE-2026-4270

MEDIUM

AWS API MCP Server 0.2.14-1.3.8 - File Access Restriction Bypass

Title source: manual
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 5.5
EPSS 0.0002
EPSS Percentile 5.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-424
Status published
Products (3)
amazon/aws_api_mcp_server 0.2.14 - 1.3.9
AWS/AWS API MCP Server 0.2.14 - 1.3.9
pypi/awslabs.aws-api-mcp-server 0.2.14 - 1.3.9PyPI
Published Mar 16, 2026
Tracked Since Mar 16, 2026