---
id: "CVE-2026-115750"
kind: "vulnerability"
aliases: ["CVE-2026-115750"]
title: "mcp-from-openapi: cross-origin redirects leak bearer tokens and cookies"
severity: "medium"
cvss: 6.3
epss: 0.00379
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-tooling", "mcp", "node", "openapi", "self-hosted"]
not_affected_if: ["local-spec-files", "no-auth-headers"]
published_at: "2026-10-23T13:17:09+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T12:38:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115750", "first_seen_at": "2026-10-23T21:57:33+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-115750", "first_seen_at": "2026-10-25T12:38:50+00:00"}]
---

# mcp-from-openapi: cross-origin redirects leak bearer tokens and cookies

mcp-from-openapi versions 2.5.0 through 2.8.x forward Authorization and Cookie headers when its safeFetch() follows a redirect to a different origin. An attacker who controls the OpenAPI spec host, or can abuse an open redirect on it, can capture bearer tokens or cookies.

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

## How to check

- Check the installed version of `mcp-from-openapi` in the project lockfile or with `npm ls mcp-from-openapi`
- Look for calls to `fromURL()` that load specs from remote hosts with credentials set in headers

## Fix

- Upgrade `mcp-from-openapi` to `2.9.0` or later
- Rotate any bearer tokens or session cookies that were sent to spec hosts while on a vulnerable version

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115750
- 2026-10-25T12:38:50+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-115750

## From the sources

mcp-from-openapi from 2.5.0 before 2.9.0 contains a credential exposure vulnerability that allows attackers to capture Authorization and Cookie headers because safeFetch() forwards them on cross-origin redirects. Attackers controlling a spec host or abusing an open redirect can redirect fromURL() spec requests to their own origin to steal bearer tokens or cookies.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_