Open Redirect Affecting @jupyter-notebook/help-extension package, versions >=7.0.0 <7.5.6
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-JUPYTERNOTEBOOKHELPEXTENSION-16347192
- published3 May 2026
- disclosed30 Apr 2026
- creditDaniel Teixeira
Introduced: 30 Apr 2026
NewCVE-2026-40171 (opens in a new tab)How to fix?
Upgrade @jupyter-notebook/help-extension to version 7.5.6 or higher.
Overview
@jupyter-notebook/help-extension is a Jupyter Notebook - Help Extension
Affected versions of this package are vulnerable to Open Redirect in the CommandLinker class. An attacker can steal authentication tokens and gain unauthorized access to user accounts by convincing a user to open a malicious notebook file and interact with a malicious element, that execute arbitrary scripts. This graphical element can be made indistinguishable from legitimate ones. The exploit may allow reading, modifying, or creating files, accessing running kernels, and creating terminals for shell access.
Note: The upgraded versions also include an option to disable command linking completely by setting
{
"@jupyterlab/apputils-extension:sanitizer": {
"allowCommandLinker": false
}
}