🛡️ CVE-2026-4270
🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-424 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE CWE-424
Public Exploit ✅ No
Source NVD
Published 2026-03-16
Updated 2026-06-15
Modified 2026-05-21
Fix URL N/A

Affected Packages

Software From version Fixed in
aws-api-mcp-server 0.2.14 1.3.9
awslabs-aws-api-mcp-server 0.2.14 1.3.9
unknown

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