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3 vulnerabilities by jlowin

CVE-2025-69196 (GCVE-0-2025-69196)

Vulnerability from cvelistv5 – Published: 2026-03-16 18:07 – Updated: 2026-03-16 19:09
VLAI?
Title
FastMCP OAuth Proxy token reuse across MCP servers
Summary
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 the base_url passed to the OAuthProxy during initialization. This issue has been patched 2.14.2.
Severity ?
7.4 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
jlowin fastmcp Affected: < 2.14.2
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CVE-2025-62801 (GCVE-0-2025-62801)

Vulnerability from cvelistv5 – Published: 2025-10-28 21:36 – Updated: 2025-10-29 14:54
VLAI?
Title
FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name
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 server_name field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor. This vulnerability is fixed in 2.13.0.
Severity ?
5.4 (Medium)
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Vendor Product Version
jlowin fastmcp Affected: < 2.13.0
Create a notification for this product.
Show details on NVD website
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CVE-2025-62800 (GCVE-0-2025-62800)

Vulnerability from cvelistv5 – Published: 2025-10-28 21:34 – Updated: 2025-10-29 15:52
VLAI?
Title
FastMCP vulnerable to reflected XSS in client's callback page
Summary
FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0 have a reflected cross-site scripting vulnerability in the OAuth client callback page (oauth_callback.py) where unescaped user-controlled values are inserted into the generated HTML, allowing arbitrary JavaScript execution in the callback server origin. The issue is fixed in version 2.13.0.
Severity ?
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
jlowin fastmcp Affected: < 2.13.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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