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CVE-2025-62800

5.3 medium SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 5.3 · jlowinNVD modified 2026-10-08 11:10

Affected (CPE criteria) 1

  • cpe:2.3:a:jlowin:fastmcp:*:*:*:*:*:*:*:*

References 2