GHSA-WHVH-WF3X-G77J JupyterLab: Allowlist/blocklist check in `PyPIExtensionManager.install()` not enforced for direct callers (missing `await`)

The extension allowlist/blocklist check inside PyPIExtensionManager.install was not enforced due to a missing await. For purposes of JupyterLab this was a secondary defense-in-depth check: install was intended to enforce the allowlist/blocklist itself for any future uses and users calling this...

PT-2026-59194

Impact The 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...

JupyterLab has an Extension Manager API/GUI Policy Discrepancy, allowing 3rd party (malicious) extensions install via POST request

The allow-list of extensions that can be installed from PyPI Extension Manager allowedextensionsuris is not correctly enforced by JupyterLab prior to 4.5.7. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This has security implications for deployments...

GHSA-VVFJ-2JQX-52JM JupyterLab LaTeX typesetter links did not enforce `noopener` attribute

Links generated with LaTeX typesetters in Markdown files and Markdown cells in JupyterLab and Jupyter Notebook did not include the noopener attribute. This is deemed to have no impact on the default installations. Theoretically users of third-party LaTeX-rendering extensions could find themselves...