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    CVE-2026-4270

    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.

    Published:Mar 16, 2026
    Last Modified:May 21, 2026
    EPS:Mar 16, 2026
    EPSS Score:0.00017
    CVSS Score:5.5

    Affected Products

    Vendor
    Amazon
    Product
    Aws Api Mcp Server
    Vendor
    Aws
    Product
    Aws Api Mcp Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-127 Directory Indexing
    CAPEC-554 Functionality Bypass

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High