Auth0OAuthenticator has an Authentication Bypass via Unverified Email Claims
Summary
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.
Impact
This is an Authentication Bypass Vulnerability. Any Auth0 tenant leveraging the Auth0OAuthenticator mapping the email claim to the JupyterHub username is impacted. By default, Auth0 handles email verification as a user flag, not a hard block to authentication streams. If an attacker can register an account with the Auth0 tenant with an unverified email and knows the email of an existing user on the system, they can authenticate as that user.
Patches
- Upgrade oauthenticator to 17.4
Workarounds
- Check
email_verifiedfield in anAuthenticator.post_auth_hookfunction - Do not use
emailas the username claim - Enforce email verification in auth0
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | oauthenticator | < 17.4.0 | 17.4.0 |
Referencias
- https://github.com/jupyterhub/oauthenticator/releases/tag/17.4.0
- https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-rrvg-cxh4-qhrv
- https://github.com/jupyterhub/oauthenticator/commit/f0c7002dc36e41efae0f674033cf7888a21d96f9
- https://nvd.nist.gov/vuln/detail/CVE-2026-33175
- https://github.com/jupyterhub/oauthenticator
- https://support.auth0.com/center/s/article/Enforce-Email-Verification-With-Sending-Email-After-Each-Denied-Access
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-287, CWE-290- Plataforma
- Python (PyPI)
- Paquete
oauthenticator- Publicada
- 03.04.2026
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2238 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-rrvg-cxh4-qhrv - CC BY 4.0
Historial de vulnerabilidades: oauthenticator
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 6
- Primera → última
- 02.2018 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 5
- Media 1
Divulgaciones por año
- 2018: 1
- 2019: 0
- 2020: 1
- 2021: 0
- 2022: 1
- 2023: 0
- 2024: 2
- 2025: 0
- 2026: 1
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Auth0OAuthenticator has an Authentication Bypass via Unverified Email Claims esta entrada
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