PYSEC-2026-2537 JupyterLab's command linker attributes in HTML enable one-click command execution from untrusted content

JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with ...

Cross-site Scripting (XSS)

Overview @jupyterlab/notebook-extension is a JupyterLab - Notebook Extension Affected versions of this package are vulnerable to Cross-site Scripting XSS via the handling of data-commandlinker-command and data-commandlinker-args attributes in HTML content. An attacker can execute arbitrary...

Cross-site Scripting (XSS)

Overview @jupyterlab/rendermime-interfaces is a JupyterLab - Interfaces for Mime Renderers Affected versions of this package are vulnerable to Cross-site Scripting XSS via the handling of data-commandlinker-command and data-commandlinker-args attributes in HTML content. An attacker can execute...