Riskcovery

CVE-2026-33175

OAuthenticator: Authentication Bypass in Auth0OAuthenticator via Unverified Email Claims

State
Published
Severity
8.8 High
Published
Apr 3, 2026
Updated
Apr 7, 2026
Reserved
Mar 17, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HGitHub_M

Weaknesses

  • CWE-287 Improper Authentication
  • CWE-290 Authentication Bypass by Spoofing

Affected Products

ProductVersions
oauthenticatorjupyterhub
  • < 17.4.0Affected

References

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