PYSEC-2026-1707
JupyterLab vulnerable to SXSS in Markdown Preview
Quick fix
PYSEC-2026-1707 — notebook: upgrade to the fixed version with the command below.
pip install --upgrade 'notebook>=7.0.7'Details
### 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.
### Patches
JupyterLab v4.0.11 was patched.
### Workarounds
Users can either disable the table of contents extension by running:
```bash jupyter labextension disable @jupyterlab/toc-extension:registry ```
### References
Vulnerability reported via the [bug bounty program](https://app.intigriti.com/programs/jupyter/jupyter/detail) [sponsored by the European Commission](https://commission.europa.eu/news/european-commissions-open-source-programme-office-starts-bug-bounties-2022-01-19_en) and hosted on the [Intigriti platform](https://www.intigriti.com/).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-4m77-cmpx-vjc4[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2024-22420[ADVISORY]
- https://github.com/jupyterlab/jupyterlab/commit/dda0033cd49449572d077bbecd33b18d8d05f48a[WEB]
- https://github.com/jupyterlab/jupyterlab/commit/e1b3aabab603878e46add445a3114e838411d2df[WEB]
- https://github.com/jupyterlab/jupyterlab[PACKAGE]
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UQJKNRDRFMKGVRIYNNN6CKMNJDNYWO2H[WEB]
- https://pypi.org/project/notebook[PACKAGE]
- https://github.com/advisories/GHSA-4m77-cmpx-vjc4[ADVISORY]