Summary
Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What type of information could be disclosed by this vulnerability?
Exploiting this vulnerability could allow the disclosure of credentials.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation requires an affected application to use a specific sign-in handling pattern and rely on default authority discovery without predefined authority metadata. Applications that do not meet both conditions are not exposed to this attack.
Security updates
7.1.0 — https://github.com/AzureAD/microsoft-authentication-library-for-js/releases
Vulnerabilities 1
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Medium 5.9
Microsoft Authentication Library (MSAL) for Node.js Information Disclosure Vulnerability
Origin validation error in Microsoft Authentication Library (MSAL) for Node.js allows an unauthorized attacker to disclose information over a network.
Revision history
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#1
Information published.
References
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CVE-2026-109461 Microsoft Authentication Library (MSAL) for Node.js Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109461
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss