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CVE-2026-33175

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-33175

Severity

8.8

High

CVSS V3

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Summary

OAuthenticator: Authentication Bypass in Auth0OAuthenticator via Unverified Email Claims

Description

OAuthenticator is software that allows OAuth2 identity providers to be plugged in and used with JupyterHub. Prior to version 17.4.0, an authentication bypass vulnerability in oauthenticator allows an attacker with an unverified email address on an Auth0 tenant to login to JupyterHub. When email is used as the usrname_claim, this gives users control over their username and the possibility of account takeover. This issue has been patched in version 17.4.0.

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