JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4.

Project Subscriptions

Vendors Products
Jupyter Subscribe
Jupyter Core Subscribe
Jupyterlab Subscribe
Notebook Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-6966-vjj6-99xv JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 02 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 30 Sep 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Jupyter
Jupyter jupyter Core
Jupyter jupyterlab
Jupyter notebook
Vendors & Products Jupyter
Jupyter jupyter Core
Jupyter jupyterlab
Jupyter notebook

Wed, 30 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Tue, 29 Sep 2026 19:15:00 +0000

Type Values Removed Values Added
Description JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4.
Title JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard
Weaknesses CWE-345
CWE-79
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-02T12:22:58.664Z

Reserved: 2026-09-29T17:25:25.266Z

Link: CVE-2026-102831

cve-icon Vulnrichment

Updated: 2026-10-02T12:22:54.379Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-29T19:17:25.700

Modified: 2026-10-02T13:17:27.660

Link: CVE-2026-102831

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-29T18:58:03Z

Links: CVE-2026-102831 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T20:30:18Z

Weaknesses