EUVD-2026-12474
GHSA-2cpp-j2fc-qhp7
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
4Description
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.
Analysis
AWS API MCP Server versions 0.2.14 through 1.3.9 contain an improper path protection flaw in the no-access and workdir features that allows local attackers to bypass file access restrictions and read arbitrary files accessible to the MCP client application. An attacker with local access and user interaction can exploit this vulnerability to expose sensitive local file contents. …
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Remediation
Within 30 days: Identify affected systems running the no-access and workdir feature of the AWS API MCP Server and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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