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    CVE-2026-33175

    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.

    Published:Apr 3, 2026
    Last Modified:Apr 15, 2026
    EPS:Apr 3, 2026
    EPSS Score:0.00099
    CVSS Score:8.8

    Affected Products

    Vendor
    Jupyter
    Product
    Oauthenticator
    Vendor
    Jupyterhub
    Product
    Oauthenticator

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-151 Identity Spoofing
    CAPEC-194 Fake the Source of Data
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-22 Exploiting Trust in Client
    CAPEC-459 Creating a Rogue Certification Authority Certificate
    CAPEC-461 Web Services API Signature Forgery Leveraging Hash Function Extension Weakness
    CAPEC-473 Signature Spoof
    CAPEC-476 Signature Spoofing by Misrepresentation
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-593 Session Hijacking
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-633 Token Impersonation
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-667 Bluetooth Impersonation AttackS (BIAS)
    CAPEC-94 Adversary in the Middle (AiTM)

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High