gcdRadar
archive/Patch now/AIR-2026-1492
closedclosed 23 Oct 2026Patch now2 Disclosed vulnerabilityAI

GHSA-7xgj-8392-5q4r: FastMCP post-transform component authorization bypass

fastmcp

FastMCP skipped post-transform component authorization on direct calls, allowing clients to invoke denied tools or prompts. The maintainers released fixes to properly authorize final transformed components.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

fix status
Fix status unknown
first report
23 Oct 2026
last update
23 Oct 2026

Timeline · 1

  1. 23 Oct 2026GHSA-7xgj-8392-5q4r: FastMCP: Post-transform component authorization is skipped on direct calls

Sources · 1

Advisories and databases

  1. 2026-10-23
    GHSA-7xgj-8392-5q4r: FastMCP: Post-transform component authorization is skipped on direct calls
    GitHub Advisory Database · github.com/advisories/GHSA-7xgj-8392-5q4r

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
ghsa-7xgj-8392-5q4rfastmcpauthorizationmcp
dates
happened 23 Oct 2026 · first reported 23 Oct 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-24 05:11Z · updated 2026-10-24 05:11Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# GHSA-7xgj-8392-5q4r: FastMCP post-transform component authorization bypass

https://gcdradar.vercel.app/incidents/ghsa-7xgj-8392-5q4r-fastmcp-post-transform-component-authori · AIR-2026-1492 · closed 2026-10-23

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-23
- AI role: Attack on AI
- Products: fastmcp

## Summary

FastMCP skipped post-transform component authorization on direct calls, allowing clients to invoke denied tools or prompts. The maintainers released fixes to properly authorize final transformed components.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-10-23: GHSA-7xgj-8392-5q4r: FastMCP: Post-transform component authorization is skipped on direct calls (https://github.com/advisories/GHSA-7xgj-8392-5q4r)

## Sources

- 2026-10-23 GitHub Advisory Database: GHSA-7xgj-8392-5q4r: FastMCP: Post-transform component authorization is skipped on direct calls https://github.com/advisories/GHSA-7xgj-8392-5q4r

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

Related

  1. closed
    FastMCP GHSA-vqqp-x5qm-5qp4: FastMCP OAuth client provider issuer binding vulnerability

    Patch now · Disclosed · since 23 Oct 2026

    AI
  2. closed6.3
    Flowise CVE-2026-127214: Flowise server-side request forgery vulnerability

    Patch now · Disclosed · since 13 Nov 2026 · CVE-2026-127214

    AI
  3. closed6.9
    vLLM CVE-2026-126395: vLLM information disclosure vulnerability in sanitize_message()

    Patch now · Disclosed · Patched · since 13 Nov 2026 · CVE-2026-126395

    AI
  4. closed7.1
    vLLM CVE-2026-126399: vLLM resource exhaustion vulnerability via video frame limits bypass

    Patch now · Disclosed · Patched · since 13 Nov 2026 · CVE-2026-126399

    AI
  5. closed8.2
    vLLM CVE-2026-126398: vLLM reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions

    Patch now · Disclosed · Patched · since 13 Nov 2026 · CVE-2026-126398

    AI
  6. closed6.9
    vLLM CVE-2026-126394: vLLM resource exhaustion vulnerability in OpenCVDynamicOpenPanguVideoBackend

    Patch now · Disclosed · Patched · since 13 Nov 2026 · CVE-2026-126394

    AI