7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-69256

CVE-2025-69256: serverless MCP Server vulnerable to command injection in list-projects tool

The Serverless Framework is a framework for using AWS Lambda and other managed cloud services to build applications. Starting in version 4.29.0 and prior to version 4.29.3, a command injection vulnerability exists in the Serverless Framework's built-in MCP server package (@serverless/mcp). This vulnerability only affects users of the experimental MCP server feature (serverless mcp), which represents less than 0.1% of Serverless Framework users. The core Serverless Framework CLI and deployment functionality are not affected. The vulnerability is caused by the unsanitized use of input parameters within a call to child_process.exec, enabling an attacker to inject arbitrary system commands. Successful exploitation can lead to remote code execution under the server process's privileges. The server constructs and executes shell commands using unvalidated user input directly within command-line strings. This introduces the possibility of shell metacharacter injection (|, >, &&, etc.). Version 4.29.3 fixes the issue.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-69256

CVE-2025-69256:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
serverless	npm	>= 4.29.0, < 4.29.3	4.29.3

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a classic command injection flaw within the @serverless/mcp package, specifically in the list-projects tool. The root cause is the use of child_process.exec to run a find command on the filesystem, where the directory path is taken directly from user input without sanitization.

The execution flow starts at the listProjects function, which receives an array of workspaceRoots from the user. This input is passed to getServerlessProjectsInfo, which in turn calls findServerlessFrameworkProjects and other finders that use findYamlFiles. The findServerlessFrameworkProjects and findYamlFiles functions in packages/mcp/src/lib/project-finder.js are the core of the vulnerability. They concatenate the user-provided path into a shell command string, allowing an attacker to inject shell metacharacters (e.g., $(command)) and achieve remote code execution.

The provided patch confirms this analysis. It replaces all calls to child_process.exec with child_process.execFile, which safely passes the directory path as an argument instead of interpreting it as part of the command. Additionally, a new validateWorkspaceDir function was added to ensure the provided path is a valid directory, providing defense-in-depth.

Vulnerable functions

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Vulnerability Intelligence
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WAF Protection Rules

WAF Rule

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Reasoning

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