Is this vulnerability remotely exploitable?

Yes. An attacker can exploit it remotely by interacting with the JupyterHub login endpoint, provided they can create or control an Auth0 account on the relevant tenant with an unverified email.

What level of access does an attacker need?

The attacker needs the ability to register or manage a user account on the affected Auth0 tenant and reach the JupyterHub instance's OAuth2 login. No prior access to JupyterHub itself is required.

What is the safest general fix pattern?

The most robust fix is to bind JupyterHub identities to stable, provider-assigned identifiers (such as `sub` or a unique user ID) and enforce that any email-based claims used in authorization are verified and non-spoofable.

Severity:

HIGH RISK

(8.8)

Authentication Bypass via Unverified Email Username Claim (CWE-287) in OAuthenticator for JupyterHub

CVE-2026-33175

Published:

Apr 3, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287;CWE-290

Impact:

Account Takeover / Unauthorized JupyterHub Access

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287;CWE-290

Impact:

Account Takeover / Unauthorized JupyterHub Access

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Authentication Bypass via Unverified Email Username Claim (CWE-287) in OAuthenticator for JupyterHub

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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