Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Summary

The jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. This vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature. A malicious user can access any data that the attacked user has access to as well as perform arbitrary requests acting as the attacked user. This issue affects JupyterLab versions through 3.6.7, 4.0.0a0 through 4.2.4 ,and Jupyter Notebook versions 7.0.0a1 through 7.2.1. Users are advised to upgrade. There is no workaround for the underlying DOM Clobbering susceptibility. However, select plugins can be disabled on deployments which cannot update in a timely fashion to minimise the risk. These are "@jupyterlab/mathjax-extension:plugin" - users will loose ability to preview mathematical equations. "@jupyterlab/markdownviewer-extension:plugin" - users will loose ability to open Markdown previews. "@jupyterlab/mathjax2-extension:plugin" (if installed with optional "jupyterlab-mathjax2" package) - an older version of the mathjax plugin for JupyterLab 4.x. To disable these extensions run "```jupyter labextension" disable "@jupyterlab/markdownviewer-extension:plugin" && "jupyter labextension" disable "@jupyterlab/mathjax-extension:plugin" && "jupyter labextension" disable "@jupyterlab/mathjax2-extension:plugin" "```" in bash.