CVE-2026-109461: Microsoft Authentication Library (MSAL) for Node.js origin validation bypass

CVE-2026-109461 · Severity: high · CVSS 7.5 · Published 2026-10-16

Microsoft Authentication Library (MSAL) for Node.js, used to handle user authentication in Node.js applications, contains an origin validation flaw that allows an attacker to bypass security checks and disclose sensitive information over the network. An attacker can exploit this vulnerability without authentication to expose data that should be protected by the authentication mechanism.

Technologies: Microsoft Authentication Library (MSAL) for Node.js. Vendors: Microsoft, npm.

Quick answers

Is CVE-2026-109461 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-109461 being exploited in the wild.
How severe is CVE-2026-109461?
High severity, with a CVSS score of 7.5, published 16 October 2026.
Which products and versions are affected?
@azure/msal-node (npm) >= 5.0.0-beta.0, < 7.1.0, SEMVER:introduced=5.0.0-beta.0,fixed=7.1.0.
Is there a fix for CVE-2026-109461?
Yes. @azure/msal-node (npm): upgrade to 7.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-109461 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-109461?
Check whether you run Microsoft Authentication Library (MSAL) for Node.js or @azure/msal-node (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • @azure/msal-node (npm): upgrade to 7.1.0 or later
    npm install @azure/msal-node@7.1.0

Technical details

The vulnerability is an origin validation error in MSAL for Node.js that fails to properly validate the origin of authentication requests. This allows an unauthenticated attacker on the network to send crafted requests that bypass origin checks and access sensitive information. The attack is network-accessible without requiring prior authentication or user interaction.

Affected products

  • Microsoft Authentication Library (MSAL) for Node.js

Identifiers

  • CVE-2026-109461
  • GHSA-xcx6-jx8p-x3h5

Timeline

  • 2026-10-16: disclosed

References

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