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High

JupyterHub OAuthenticator elevation of privilege

  • Disclosed: 18.02.2018
  • Updated: 11.10.2026 12:18

An issue was discovered in Project Jupyter JupyterHub OAuthenticator 0.6.x before 0.6.2 and 0.7.x before 0.7.3. When using JupyterHub with GitLab group whitelisting for access control, group membership was not checked correctly, allowing members not in the whitelisted groups to create accounts on the Hub. (Users were not allowed to access other users' accounts, but could create their own accounts on the Hub linked to their GitLab account. GitLab authentication not using gitlab_group_whitelist is unaffected. No other Authenticators are affected.)

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) oauthenticator >= 0.6, < 0.6.2, >= 0.7, < 0.7.3 0.6.2, 0.7.3

References

CVSS score 8.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
-
Platform
Python (PyPI)
Package
oauthenticator
Disclosed
18.02.2018
Updated
11.10.2026 12:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2018-68 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-8x3m-m3x9-54fj - CC BY 4.0

Vulnerability history: oauthenticator

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries
6
First → latest
02.2018 04.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 5
  • Medium 1

Disclosures per year

  1. Auth0OAuthenticator has an Authentication Bypass via Unverified Email Claims
    High · 8.8 CVE-2026-33175 < 17.4.0 17.4.0
  2. Globus `identity_provider` restriction ignored when used with `allow_all` in JupyterHub 5.0
    High · 8.1 CVE-2024-37300 < 16.3.1 16.3.1
  3. GoogleOAuthenticator.hosted_domain incorrectly verifies membership of an Google organization/workspace
    High · 7.5 CVE-2024-29033 < 16.3.0 16.3.0
  4. OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is pr
    Medium · 4.2 CVE-2022-31027 < 15.0.0 15.0.0
  5. Base class whitelist configuration ignored in OAuthenticator
    High · 6.3 CVE-2020-26250 >= 0.12.0, < 0.12.2 0.12.2
  6. JupyterHub OAuthenticator elevation of privilege this entry
    High · 8.8 CVE-2018-7206 >= 0.6, < 0.6.2, >= 0.7, < 0.7.3 0.6.2, 0.7.3

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