CVE-2026-33175HIGH 8.8EPSS p27.2%

CVE-2026-33175CVE-2026-33175

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.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS0.36% probability of exploitation · percentile 27.2% · 2026-06-19T12:03:05Z
Published2026-04-03
Last modified2026-04-15

Underlying weaknesses· 2

CWE-287CWE-290

References

  1. https://github.com/jupyterhub/oauthenticator/commit/f0c7002dc36e41efae0f674033cf7888a21d96f9
  2. https://github.com/jupyterhub/oauthenticator/releases/tag/17.4.0
  3. https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-rrvg-cxh4-qhrv

2

TypeTargetConfidenceTier
WeaknessImproper Authenticationcwe-2870%live
WeaknessAuthentication Bypass by Spoofingcwe-2900%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.