GHSA-rrvg-cxh4-qhrv

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Source
https://github.com/advisories/GHSA-rrvg-cxh4-qhrv
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-rrvg-cxh4-qhrv/GHSA-rrvg-cxh4-qhrv.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-rrvg-cxh4-qhrv
Aliases
Related
Published
2026-04-03T21:35:37Z
Modified
2026-04-06T23:20:53.437849Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Auth0OAuthenticator has an Authentication Bypass via Unverified Email Claims
Details

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

Database specific 
{
    "severity": "HIGH",
    "github_reviewed_at": "2026-04-03T21:35:37Z",
    "cwe_ids": [
        "CWE-287",
        "CWE-290"
    ],
    "github_reviewed": true,
    "nvd_published_at": "2026-04-03T22:16:26Z"
}
References

Affected packages

PyPI / oauthenticator

Package

Name
oauthenticator
View open source insights on deps.dev
Purl
pkg:pypi/oauthenticator

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
17.4.0

Affected versions

0.*
0.1.0
0.2.0
0.3.0
0.4.0
0.4.1
0.5.0
0.5.1
0.6.0
0.6.1
0.6.2
0.7.0
0.7.1
0.7.2
0.7.3
0.8.0
0.8.1
0.8.2
0.9.0
0.10.0
0.11.0
0.12.0
0.12.1
0.12.2
0.12.3
0.13.0
14.*
14.0.0
14.1.0
14.2.0
15.*
15.0.0
15.0.1
15.1.0
16.*
16.0.0
16.0.1
16.0.2
16.0.3
16.0.4
16.0.5
16.0.6
16.0.7
16.1.0
16.1.1
16.2.0
16.2.1
16.3.0
16.3.1
17.*
17.0.0
17.1.0
17.2.0
17.3.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-rrvg-cxh4-qhrv/GHSA-rrvg-cxh4-qhrv.json"