CVE-2026-59831

GitHub CLI gh is GitHub’s official command line tool. From 2.10.0 through 2.95.0, connecting to a malicious Codespace with gh codespace jupyter can allow command execution because the command opens a JupyterLab URL supplied by a process inside the Codespace without validating that it is a loopbac...

HTML injection in Jupyter Notebook and JupyterLab leading to DOM Clobbering

ImpactThe 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...

PYSEC-2026-1481 HTML injection in Jupyter Notebook and JupyterLab leading to DOM Clobbering

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...

PYSEC-2026-1706 JupyterLab vulnerable to potential authentication and CSRF tokens leak

Impact Users of JupyterLab who click on a malicious link may get their Authorization and XSRFToken tokens exposed to a third party when running an older jupyter-server version. Patches JupyterLab 4.1.0b2, 4.0.11, and 3.6.7 were patched. Workarounds No workaround has been identified, however users...

CVE-2026-40171

A flaw was found in Jupyter Notebook and JupyterLab. A stored cross-site scripting XSS vulnerability in the help command linker can be exploited by an attacker who crafts a malicious notebook file. When a user interacts with this file, the XSS is triggered, allowing the attacker to steal...

CVE-2026-42266

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager allowedextensionsuris is not correctly enforced by JupyterLab. The Py...

CVE-2026-42266 JupyterLab has an Extension Manager API/GUI Policy Discrepancy allowing 3rd party (malicious) extensions install via POST request.

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager allowedextensionsuris is not correctly enforced by JupyterLab. The Py...

jupyter-jupyterlab-4.5.7-1.1 on GA media (moderate)

jupyter-jupyterlab-4.5.7-1.1 on GA media Announcement ID: openSUSE-SU-2026:10748-1 Rating: moderate Cross-References: CVE-2026-40171 CVE-2026-42266 CVE-2026-42557 Affected Products: openSUSE Tumbleweed An update that solves 3 vulnerabilities can now be installed. Description: These are all securi...

BIT-JUPYTERLAB-2026-40171 Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

BIT-JUPYTER-BASE-NOTEBOOK-2026-40171 Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

OPENSUSE-SU-2026:10748-1 jupyter-jupyterlab-4.5.7-1.1 on GA media

These are all security issues fixed in the jupyter-jupyterlab-4.5.7-1.1 package on the GA media of openSUSE Tumbleweed...

Linux Distros Unpatched Vulnerability : CVE-2026-40171

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and...

CVE-2026-40171

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

DEBIAN-CVE-2026-40171

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

CVE-2026-40171

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

CVE-2026-40171

CVE-2026-40171 affects Jupyter components prior to fixes: Notebook 7.0.0–7.5.5, JupyterLab up to 4.5.6, and related help extensions (@jupyter-notebook/help-extension, @jupyterlab/help-extension). The root cause is a stored XSS in the CommandLinker used by the Help Extension, which can be chained ...

CVE-2026-40171 Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

CVE-2026-40171 Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with...

@fails-components/jupyter-applet-view (>=0.0.1-alpha.3 <=0.0.1-alpha.18), @fails-components/jupyter-filesystem-extension (>=0.0.1-alpha.3 <=0.0.1-alpha.18) +3 more potentially affected by CVE-2026-40171 via @jupyterlab/help-extension (>=4.0.13 <=4.4.10)

@jupyterlab/help-extension NPM version =4.0.13, =0.0.1-alpha.3, =0.0.1-alpha.3, =0.0.1-alpha.3, =0.0.1-alpha.3, =0.2.0, =0.6.0-alpha.9 Source cves: CVE-2026-40171 Source advisory: SNYK:JS-JUPYTERLABHELPEXTENSION-16347193...

PT-2026-36305

Name of the Vulnerable Software and Affected Versions Jupyter Notebook versions prior to 7.5.6 JupyterLab versions prior to 4.5.7 Description A stored Cross-Site Scripting XSS issue allows attackers to steal authentication tokens from users who open malicious notebook files and interact with...