CVE Catalog

CVE-2026-33175

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.44%

36th percentile - higher than 36% of all known CVEs

Summary

OAuthenticator before version 17.4.0 has an authentication bypass vulnerability. An attacker with an unverified email address on an Auth0 tenant can log in to JupyterHub, and if email is used as the username, they can take over accounts.

Risk Assessment

An attacker can gain unauthorized access to JupyterHub and potentially take over other users' accounts, leading to data leakage or manipulation.

Recommendation

Update OAuthenticator to version 17.4.0, which fixes this vulnerability.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS