---
id: "CVE-2026-124726"
page: "https://infrastack.ai/live/CVE-2026-124726"
kind: "vulnerability"
aliases: ["CVE-2026-124726"]
title: "Apache APISIX: MCP caller can reach undeclared API endpoints with route credentials"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-tooling", "apache-apisix", "api-gateway", "mcp"]
not_affected_if: ["no-mcp-endpoint", "version-outside-3.19.0-to-3.20.0"]
published_at: "2026-11-13T18:17:32+00:00"
first_seen_at: "2026-11-13T18:49:29+00:00"
updated_at: "2026-11-13T18:51:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124726", "first_seen_at": "2026-11-13T18:49:29+00:00"}]
exploit_sources: []
---

# Apache APISIX: MCP caller can reach undeclared API endpoints with route credentials

Link for people: https://infrastack.ai/live/CVE-2026-124726 (this .md is for agents)

Apache APISIX's MCP endpoint lets a caller reach API endpoints that the OpenAPI document never declared, using the HTTP method of a declared tool. The requests carry the credentials that the Route adds, so the caller gets access those credentials permit.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Apache APISIX version with `apisix version` or the image tag; affected versions are from `3.19.0` before `3.20.0`.
- Look for routes that expose the MCP endpoint and use the OpenAPI-to-MCP tool conversion, since those are the exposed path.

## Fix

- Apache APISIX: upgrade to `3.20.0`.

## Timeline

- 2026-11-13T18:49:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124726

## From the sources

Relative Path Traversal, with Unintended Proxy vulnerability in Apache APISIX.



A caller of the MCP endpoint can invoke endpoints the OpenAPI document
never declared, under the declared tool's HTTP method, using the credentials the
Route adds. This issue affects Apache APISIX: from 3.19.0 before 3.20.0.



Users are recommended to upgrade to version 3.20.0, which fixes the issue.

---

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