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

MEDIUM 5.9CVE-2026-109461 · GHSA-xcx6-jx8p-x3h5 · Published 16/10/2026 · updated 18/10/2026

In short

CVE-2026-109461 is a MEDIUM (CVSS 5.9) vulnerability affecting @azure/msal-node.
Chance of exploitation in the next 30 days (EPSS): 0.36%, higher than 30.1% of all vulnerabilities.
Fix: update to 7.1.0 or later.

Package	Affected versions	Patched versions
@azure/msal-node npm	`≥ 5.0.0-beta.0, < 7.1.0`	`7.1.0`

Description

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

NVD description

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

References

More vulnerabilities in @azure/msal-node

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Package

Affected versions

Patched versions

@azure/msal-node

npm

≥ 5.0.0-beta.0, < 7.1.0

7.1.0

Description

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

NVD description

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