CVE-2026-4270

MEDIUM

5.5

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.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published3/16/2026

Last Modified3/17/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-424

References

https://aws.amazon.com/security/security-bulletins/2026-007-AWS/(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://pypi.org/project/awslabs.aws-api-mcp-server/1.3.9/(ff89ba41-3aa1-4d27-914a-91399e9639e5)

IOC Correlations

No correlations recorded

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