CVE-2024-35225

CRITICAL9.6EPSS 1.1%

Jupyter Server Proxy has a reflected XSS issue in host parameter

Published: 6/11/2024Modified: 2/4/2026

Description

### Impact There is a reflected cross-site scripting (XSS) issue in `jupyter-server-proxy`[1]. The `/proxy` endpoint accepts a `host` path segment in the format `/proxy/<host>`. When this endpoint is called with an invalid `host` value, `jupyter-server-proxy` replies with a response that includes the value of `host`, without sanitization [2]. A third-party actor can leverage this by sending a phishing link with an invalid `host` value containing custom JavaScript to a user. When the user clicks this phishing link, the browser renders the response of `GET /proxy/<host>`, which runs the custom JavaScript contained in `host` set by the actor. As any arbitrary JavaScript can be run after the user clicks on a phishing link, this issue permits extensive access to the user's JupyterLab instance for an actor. This issue exists in the latest release of `jupyter-server-proxy`, currently `v4.1.2`. **Impacted versions:** `>=3.0.0,<=4.1.2` ### Patches The patches are included in `==4.2.0` and `==3.2.4`. ### Workarounds Server operators who are unable to upgrade can disable the `jupyter-server-proxy` extension with: ``` jupyter server extension disable jupyter-server-proxy ``` ### References [1] : https://github.com/jupyterhub/jupyter-server-proxy/ [2] : https://github.com/jupyterhub/jupyter-server-proxy/blob/62a290f08750f7ae55a0c29ca339c9a39a7b2a7b/jupyter_server_proxy/handlers.py#L328

Affected packages (2)

  • PyPI/jupyter-server-proxy>= 3.0.0, < 3.2.4
  • PyPI/jupyter-server-proxyfrom 0, < 7abc9dc5bbb0b4b440548a5375261b8b8192fc22, < ff78128087e73fb9d0909e1366f8bf051e8ea878, < 7abc9dc5bbb0b4b440548a5375261b8b8192fc22, < ff78128087e73fb9d0909e1366f8bf051e8ea878 | >= 3.0.0, < 3.2.4, >= 4.1.2, < 4.2.0

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1CRITICAL9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References (7)