CVE-2026-33175
Published:April 03, 2026
Updated:April 20, 2026
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.
Affected Packages
oauthenticator (CONDA):
Affected version(s) >=0.8.1 <17.4.0Fix Suggestion:
Update to version 17.4.0https://github.com/jupyterhub/oauthenticator.git (GITHUB):
Affected version(s) >=0.1.0 <17.4.0Fix Suggestion:
Update to version 17.4.0oauthenticator (PYTHON):
Affected version(s) >=0.1.0 <17.4.0Fix Suggestion:
Update to version 17.4.0oauthenticator (PYTHON):
Affected version(s) >=0.1.0 <17.4.0Fix Suggestion:
Update to version 17.4.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
EPSS
Base Score:
0.10
