Jupyterhub vulnerabilities

CVE-2024-41942 [HIGH] CWE-274 CVE-2024-41942: JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to versions 4.1.6 and 5.1.0, if a user is granted the `admin:users` scope, they may escalate their own privileges by making themselves a full admin user. The impact is relatively small in that `admin:users` is already an extremely privileged scope only gr

CVE-2021-41247 [HIGH] CWE-613 CVE-2021-41247: JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who have multiple JupyterLab tabs open in the same browser session, may see incomplete logout from the single-user server, as fresh credentials (for the single-user server only, not the Hub) reinstated after logout, if another active JupyterLab session is

CVE-2026-54338 [MEDIUM] CWE-400 CVE-2026-54338: JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. Prior JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. Prior to 5.5.0, invalid input to form-based login authenticators can place an unbounded attacker-controlled username in failed-login logs, allowing an unauthenticated attacker to consume logging and storage resources. This issue is fixed in version 5.5.0.

CVE-2026-33709 [MEDIUM] CWE-601 CVE-2026-33709: JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instea

CVE-2024-28233 [MEDIUM] CWE-79 CVE-2024-28233: JupyterHub is an open source multi-user server for Jupyter notebooks. By tricking a user into visiti JupyterHub is an open source multi-user server for Jupyter notebooks. By tricking a user into visiting a malicious subdomain, the attacker can achieve an XSS directly affecting the former's session. More precisely, in the context of JupyterHub, this XSS could achieve full access to JupyterHub API and user's single-user server. The affected configurat

CVE-2026-40864 [MEDIUM] CWE-352 CVE-2026-40864: JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. In ver JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. In versions 4.1.0 through 5.4.4, XSRF protection (updated in 4.1.0) inappropriately treated requests with Sec-Fetch-Mode: no-cors as same-origin requests, bypassing XSRF checks. The JSON API is not affected, only HTTP form endpoints, such as /hub/spawn and

CVE-2019-10255 [MEDIUM] CWE-601 Open Redirect vulnerability in jupyterhub and notebook Open Redirect vulnerability in jupyterhub and notebook An Open Redirect vulnerability for all browsers in Jupyter Notebook before 5.7.8 and some browsers (Chrome, Firefox) in JupyterHub before 0.9.6 allows crafted links to the login page, which will redirect to a malicious site after successful login. Servers running on a base_url prefix are not affected.

CVE-2026-108752 [MEDIUM] CWE-694 CVE-2026-108752: JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated us JupyterHub through 6.0.1 contains an identifier collision vulnerability that allows authenticated users to overwrite another user's named-server OAuth client by registering a hyphenated username. Attackers holding a name like alice-prod can overwrite the client for alice's server prod, breaking OAuth login and revoking tokens by stopping their own

CVE-2020-36191 [MEDIUM] CWE-352 Cross-Site Request Forgery in JupyterHub Cross-Site Request Forgery in JupyterHub JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an `_xsrf` field, as demonstrated by a /hub/api/user request (to add or remove a user account).