What’s Vulnerable › Vulnerabilities

CVE-2024-21632: omniauth-microsoft_graph vulnerable to account takeover (nOAuth)

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-02 · updated 2026-06-17
• Weakness: CWE-287

Description

omniauth-microsoft_graph provides an Omniauth strategy for the Microsoft Graph API. Prior to versions 2.0.0, the implementation did not validate the legitimacy of the `email` attribute of the user nor did it give/document an option to do so, making it susceptible to nOAuth misconfiguration in cases when the `email` is used as a trusted user identifier. This could lead to account takeover. Version 2.0.0 contains a fix for this issue.

Affected products

• Recognizeapp Omniauth::Microsoftgraph: before 2.0.0 — fixed in 2.0.0

How to fix

Upgrade to a fixed version: Recognizeapp Omniauth::Microsoftgraph 2.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/synth/omniauth-microsoft_graph/commit/f132078389612b797c872b45bd0e0b47382414c1
• https://github.com/synth/omniauth-microsoft_graph/security/advisories/GHSA-5g66-628f-7cvj
• https://www.descope.com/blog/post/noauth
• https://github.com/synth/omniauth-microsoft_graph/commit/f132078389612b797c872b45bd0e0b47382414c1
• https://github.com/synth/omniauth-microsoft_graph/security/advisories/GHSA-5g66-628f-7cvj
• https://www.descope.com/blog/post/noauth

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