EUVD-2026-21656
GHSA-fgmx-xfp3-w28p
CVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the allowed commands list. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the MCP server. Was ZDI-CAN-27969.
Analysis
Remote code execution in aws-mcp-server 1.3.0 allows unauthenticated attackers to execute arbitrary commands via command injection in the allowed commands list handler. The vulnerability stems from improper validation of user-supplied strings before system call execution, enabling attackers to run code in the MCP server context with no authentication required. …
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Remediation
Within 24 hours: Inventory all systems running aws-mcp-server and isolate affected instances from production networks if patching is not immediately possible. Within 7 days: Contact AWS support for patch availability timeline and interim guidance; implement network segmentation to restrict access to MCP server ports to trusted sources only. …
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