JupyterLab vulnerable to SXSS in Markdown Preview
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:
jupyter labextension disable @jupyterlab/toc-extension:registryReferences
Vulnerability reported via the bug bounty program sponsored by the European Commission and hosted on the Intigriti platform.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | jupyterlab | >= 4.0.0, < 4.0.11 | 4.0.11 |
| Python (PyPI) | notebook | >= 7.0.0, < 7.0.7 | 7.0.7 |
References
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-4m77-cmpx-vjc4
- https://nvd.nist.gov/vuln/detail/CVE-2024-22420
- https://github.com/jupyterlab/jupyterlab/commit/dda0033cd49449572d077bbecd33b18d8d05f48a
- https://github.com/jupyterlab/jupyterlab/commit/e1b3aabab603878e46add445a3114e838411d2df
- https://github.com/jupyterlab/jupyterlab
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UQJKNRDRFMKGVRIYNNN6CKMNJDNYWO2H
- https://pypi.org/project/notebook
- https://github.com/advisories/GHSA-4m77-cmpx-vjc4
- https://pypi.org/project/jupyterlab
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
jupyterlab, notebook- Disclosed
- 19.01.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1707 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2535 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-4m77-cmpx-vjc4 - CC BY 4.0
Vulnerability history: jupyterlab
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 19
- First → latest
- 08.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 8
- Medium 8
- Low 2
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 4
- 2025: 1
- 2026: 13
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