> CVE-2026-33175 [HIGH]

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PUBLISHED
2026-04-03 22:16
MODIFIED
2026-04-03 22:16
CVSS_SCORE V3
8.8
EPSS (Prob. Exploit)
0.45%
Top 61.0%
DATA SOURCES:
NVD đź”— 2026-04-03 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-08 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-01

> DESCRIPTION

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_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EXPLOITABILITY
2.8
IMPACT
5.9

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-287 CWE-290

> CWE DETAILED DESCRIPTIONS

CWE-287: Improper Authentication - When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. | CWE-290: Authentication Bypass by Spoofing - This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

> GITHUB SECURITY ADVISORY

GHSA-rrvg-cxh4-qhrv HIGH

Auth0OAuthenticator has an Authentication Bypass via Unverified Email Claims

AFFECTED PACKAGES:
PIP / oauthenticator
< 17.4.0
Fixed in: 17.4.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

OAuthenticator: Authentication Bypass in Auth0OAuthenticator via Unverified Email Claims

AFFECTED PACKAGES:
Unknown / Unknown
44 versions affected
ALIASES:
GHSA-rrvg-cxh4-qhrv, PYSEC-2026-2238

> HISTORIQUE DES MODIFICATIONS

Première apparition
03/04/2026 22:16
Source: NVD
đź“Š ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-287: Improper Authentication - When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. | CWE-290: Authentication Bypass by Spo...
Total des modifications: 1 Dernière mise à jour: 6 months ago

> REFERENCES

https://github.com/jupyterhub/oauthenticator/commit/f0c7002dc36e41efae0f674033cf...
https://github.com/jupyterhub/oauthenticator/releases/tag/17.4.0
https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-rrvg-cxh4-...
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