CVE-2026-5059
Command Injection in aws-mcp-server Allows Remote Code Execution
Publication date: 2026-04-11
Last updated on: 2026-04-11
Assigner: Zero Day Initiative
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| aws | aws_mcp_server | to 2026-5059 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-78 | The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2026-5059 is a critical remote code execution vulnerability in the aws-mcp-server product. It occurs due to improper validation of user-supplied strings in the handling of the allowed commands list. This flaw allows remote attackers to execute arbitrary system commands on affected installations without needing to authenticate.
How can this vulnerability impact me? :
Exploiting this vulnerability enables attackers to run arbitrary code with the privileges of the MCP server. This can lead to a full compromise of the affected system, impacting its confidentiality, integrity, and availability.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
This vulnerability allows remote attackers to execute arbitrary code on the affected aws-mcp-server without authentication, potentially compromising the confidentiality, integrity, and availability of the system.
Such a compromise could lead to unauthorized access to sensitive data, which may impact compliance with common standards and regulations like GDPR and HIPAA that require protection of personal and health information.
Organizations using the affected software should consider this vulnerability a serious risk to their regulatory compliance posture due to the potential for data breaches and system compromise.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this critical remote code execution vulnerability in aws-mcp-server, immediate steps include restricting network access to the MCP server to trusted sources only and monitoring for any unusual or unauthorized command executions.
Additionally, applying any available patches or updates from the vendor that address this vulnerability is essential to prevent exploitation.
Since the vulnerability allows unauthenticated remote code execution via improper validation of user-supplied commands, disabling or limiting the allowed commands list functionality until a fix is applied can reduce risk.