---
id: "CVE-2026-109461"
kind: "vulnerability"
aliases: ["CVE-2026-109461", "GHSA-xcx6-jx8p-x3h5"]
title: "MSAL Node authorization code flow may disclose parameters to an attacker-controlled endpoint"
severity: "high"
cvss: 7.5
epss: 0.00348
exploited: false
status: "open"
category: "package"
products: [{"name": "@azure/msal-node", "fixed": ["7.1.0"], "affected": ">= 5.0.0-beta.0, < 7.1.0", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["authentication", "azure", "cwe-346", "msal", "node", "npm", "package"]
not_affected_if: ["no-auth-code-flow", "version-7.1.0-or-later"]
published_at: "2026-10-16T18:17:31+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-25T03:24:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109461", "first_seen_at": "2026-10-23T21:57:13+00:00"}, {"source": "ghsa", "url": "https://github.com/advisories/GHSA-xcx6-jx8p-x3h5", "first_seen_at": "2026-10-23T22:22:36+00:00"}]
---

# MSAL Node authorization code flow may disclose parameters to an attacker-controlled endpoint

The Microsoft Authentication Library for Node.js (@azure/msal-node) has an origin validation error in its authorization code flow. An unauthorized network attacker can receive information sent during the token exchange, such as authorization parameters.

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

## Affected

- npm:@azure/msal-node affected >= 5.0.0-beta.0, < 7.1.0 fixed 7.1.0

## How to check

- Run `npm ls @azure/msal-node` and look for any version from `5.0.0-beta.0` up to but not including `7.1.0`
- Search lockfiles for `@azure/msal-node` and check the resolved version

## Fix

- Upgrade `@azure/msal-node` to `7.1.0` or higher
- Until upgraded, pass only the auth_code to `acquireTokenByCode`, per the advisory workaround

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109461
- 2026-10-23T22:22:36+00:00 ghsa https://github.com/advisories/GHSA-xcx6-jx8p-x3h5

## From the sources

### Impact

Origin validation error in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to disclose information over a network. This affects the auth_code flow.

### Patches

Version 7.1.0 and higher are patched.

### Workarounds

Ensure you pass in only the auth_code to to acquireTokenByCode

---

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