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    CVE-2025-62800

    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.

    Published:Oct 28, 2025
    Last Modified:Nov 7, 2025
    EPS:Oct 28, 2025
    EPSS Score:0.00102
    CVSS Score:6.1

    Affected Products

    Vendor
    Fastmcp
    Product
    Fastmcp
    Vendor
    Jlowin
    Product
    Fastmcp

    Exploits

    https://github.com/jlowin/fastmcp/security/advisories/GHSA-mxxr-jv3v-6pgchttps://github.com/jlowin/fastmcp/security/advisories/GHSA-mxxr-jv3v-6pgc

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High