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Advisory record · GHSA-vqqp-x5qm-5qp4

FastMCP MCP client wrappers construct M2M OAuth providers without issuer binding — client secret redirectable to attacker-advertised authorization server

CVSS 5.9 Medium

Published by the GitHub Advisory Database at 23 Oct 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
fastmcpPyPI>=4.0.0a1, <4.1.24.1.2
fastmcp-slimPyPI>=4.0.0a1, <4.1.24.1.2
Identifiers
GHSA-vqqp-x5qm-5qp4
Weakness (CWE)
CWE-287 · CWE-522
Tags
Published
23 Oct 2026
Updated
23 Oct 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.9 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:08 UTC First seen by agentprime
  2. 31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.