Jupyter Notebook Vulnerable to Authentication Token Theft via CommandLinker XSS
Impact
A stored Cross-Site Scripting (XSS) vulnerability in Jupyter Notebook allows attackers to steal authentication tokens from users who open malicious notebook files and interact with elements that the attacker can make look indistinguishable from legitimate controls (single click interaction).
The vulnerability enables complete account takeover through the Jupyter REST API, allowing the attacker to:
- Read all files
- Modify/create files
- Access running kernels and execute arbitrary code
- Create terminals for shell access
Patches
Jupyter Notebook 7.5.6 and JupyterLab 4.5.7 include patches for this vulnerability.
Workarounds
The help extension can be disabled via CLI:
jupyter labextension disable @jupyter-notebook/help-extension
jupyter labextension disable @jupyterlab/help-extensionHardening
The patched versions include a toggle to disable the command linker functionality altogether, for example via overrides.json:
{
"@jupyterlab/apputils-extension:sanitizer": {
"allowCommandLinker": false
}
}Resources
- https://jupyterlab.readthedocs.io/en/latest/user/commands.html#commands-in-markdown-output-and-files
Acknowledgments
Reported by Daniel Teixeira - NVIDIA AI Red Team
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | @jupyterlab/help-extension | < 4.5.7 | 4.5.7 |
| Paquete de npm | @jupyter-notebook/help-extension | >= 7.0.0, < 7.5.6 | 7.5.6 |
| Python (PyPI) | jupyterlab | < 4.5.7 | 4.5.7 |
| Python (PyPI) | notebook | >= 7.0.0, < 7.5.6 | 7.5.6 |
Referencias
- https://github.com/jupyter/notebook/security/advisories/GHSA-rch3-82jr-f9w9
- https://nvd.nist.gov/vuln/detail/CVE-2026-40171
- https://github.com/jupyter/notebook
- https://jupyterlab.readthedocs.io/en/latest/user/commands.html#commands-in-markdown-output-and-files
- https://pypi.org/project/jupyterlab
- https://github.com/advisories/GHSA-rch3-82jr-f9w9
- https://pypi.org/project/notebook
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N- Debilidad (CWE)
CWE-601, CWE-79- Plataforma
- npm, Python (PyPI)
- Paquete
@jupyterlab/help-extension, @jupyter-notebook/help-extension, jupyterlab- Publicada
- 30.04.2026
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2538 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2682 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-rch3-82jr-f9w9 - CC BY 4.0
Historial de vulnerabilidades: jupyterlab
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 19
- Primera → última
- 08.2021 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 8
- Media 8
- Baja 2
Divulgaciones por año
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 4
- 2025: 1
- 2026: 13
-
Jupyter Notebook Vulnerable to Authentication Token Theft via CommandLinker XSS esta entrada
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