PT-2026-29413

Name of the Vulnerable Software and Affected Versions FastMCP versions prior to 3.2.0 Description FastMCP, a framework for building MCP applications, is susceptible to command injection on Windows systems when server names contain shell metacharacters, such as &. This occurs during the fastmcp...

Security Bulletin: Command Injection Vulnerability in FastMCP server_name Field Enables Arbitrary Command Execution on Windows affects watsonx.data

Summary FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0, a command-injection vulnerability lets any attacker who can influence the servername field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor. This can affect...

CVE-2025-69196

A flaw was found in FastMCP, a framework for building MCP applications. The server does not correctly process the resource parameter provided by the client during authorization and token requests. This can lead to security tokens being issued for an unintended base URL Uniform Resource Locator...

Incorrect Authorization

Overview fastmcp is a The fast, Pythonic way to build MCP servers and clients. Affected versions of this package are vulnerable to Incorrect Authorization due to improper handling of the resource parameter in the authorization and token request processes. An attacker can gain unauthorized access ...

CVE-2025-69196

The GHSA advisory GHSA-5H2M-4Q8J-PQPJ describes a misconfiguration in FastMCP OAuth Proxy where the token issuer/audience are derived from the proxy’s base_url, causing access and refresh tokens to be issued without binding to the requested MCP server resource. This means tokens can be used on ot...

CVE-2025-69196 FastMCP OAuth Proxy token reuse across MCP servers

FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for...

CVE-2025-69196 FastMCP OAuth Proxy token reuse across MCP servers

FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for...

CVE-2025-69196 FastMCP OAuth Proxy token reuse across MCP servers

FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for...

GHSA-5H2M-4Q8J-PQPJ FastMCP OAuth Proxy token reuse across MCP servers

While testing the OAuth Proxy implementation, it was noticed that the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for this MCP server, the token is issued for the baseurl passed to...

CVE-2025-69196: Incorrect Authorization

FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for...

FastMCP 安全漏洞

FastMCP is a MCP server-building software developed by Jeremiah Lowin. Versions of FastMCP prior to 2.14.2 contained security vulnerabilities. These vulnerabilities stemmed from servers failing to properly handle resource parameters submitted by clients during authorization and token requests. As...

CVE-2025-69196

creationtimestamp| type| source ---|---|--- 2026-03-15 18:01:33+00:00| published-proof-of-concept| https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-5h2m-4q8j-pqpj...

GHSA-RCFX-77HG-W2WV FastMCP updated to MCP 1.23+ due to CVE-2025-66416

There was a recent CVE report on MCP: https://nvd.nist.gov/vuln/detail/CVE-2025-66416. FastMCP does not use any of the affected components of the MCP SDK directly. However, FastMCP versions prior to 2.14.0 did allow MCP SDK versions 1.23 that were vulnerable to CVE-2025-66416. Users should upgrad...

FastMCP updated to MCP 1.23+ due to CVE-2025-66416

There was a recent CVE report on MCP: https://nvd.nist.gov/vuln/detail/CVE-2025-66416. FastMCP does not use any of the affected components of the MCP SDK directly. However, FastMCP versions prior to 2.14.0 did allow MCP SDK versions 1.23 that were vulnerable to CVE-2025-66416. Users should upgrad...

EUVD-2025-205459

FastMCP updated to MCP 1.23+ due to CVE-2025-66416...

Reflected Cross Site Scripting (XSS)

FastMCP is vulnerable to a reflected cross-site scripting XSS. The vulnerability is due to unescaped user-controlled input being reflected in the OAuth client callback HTML page oauthcallback.py, which allows an attacker to inject and execute arbitrary JavaScript in the context of the callback...

Command Injection

FastMCP is vulnerable to a command injection. The vulnerability is due to improper sanitization of the servername field in MCP, which allows an attacker to inject and execute arbitrary operating system commands on Windows hosts...

CVE-2025-66416 DNS Rebinding Protection Disabled by Default in Model Context Protocol Python SDK for Servers Running on Localhost

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol MCP. Prior to version 1.23.0, tThe Model Context Protocol MCP Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost...

CVE-2025-66416: Initialization of a Resource with an Insecure Default

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol MCP. Prior to version 1.23.0, tThe Model Context Protocol MCP Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost...

CVE-2025-62801

FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0, a command-injection vulnerability lets any attacker who can influence the servername field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor. This vulnerability is fix...