Jupyter Notebook Vulnerable to Authentication Token Theft via CommandLinker XSS

GHSA-rch3-82jr-f9w9 · BIT-jupyter-base-notebook-2026-40171 · BIT-jupyter-notebook-2026-40171 · BIT-jupyterlab-2026-40171 · CVE-2026-40171 · PYSEC-2026-2538 · PYSEC-2026-2682 · 갱신 2026. 9. 10.

생태계	패키지	수정 버전
npm	@jupyter-notebook/help-extension	7.5.6
PyPI	notebook	7.5.6
PyPI	jupyterlab	4.5.7
npm	@jupyterlab/help-extension	4.5.7

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-extension

Hardening

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

Jupyter Notebook Vulnerable to Authentication Token Theft via CommandLinker XSS

Jupyter Notebook Vulnerable to Authentication Token Theft via CommandLinker XSS

영향 받는 패키지

원문

Impact

Patches

Workarounds

Hardening

Resources

Acknowledgments

출처