CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2026-33175
High (8.8) in jupyter oauthenticator. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in oauthenticator 17.4.0.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-287, CWE-290
- Published
- Modified
- Record from
- the NVD, synced
Affected
- jupyter:oauthenticator
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-rrvg-cxh4-qhrv | PyPI | oauthenticator | <17.4.0 | 17.4.0 |
| PYSEC-2026-2238 | PyPI | oauthenticator | <17.4.0 | 17.4.0 |