CVE-2026-102831: high-severity vulnerability in jupyterlab
JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.2%
exploitation probability
0.2%top 91% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Related CVEs — jupyterlab
In the same product, most dangerous first.
CVE-2021-32797HIGHJupyterLab: XSS due to lack of sanitization of the action attribute of an html <form>EPSS 2.7%CVE-2026-42266HIGHJupyterLab has an Extension Manager API/GUI Policy Discrepancy allowing 3rd party (malicious) extensions install via POST request.EPSS 0.9%CVE-2026-73417HIGHJupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`)EPSS 0.7%CVE-2026-73415HIGHjupyterlab: Image viewer in JupyterLab allows XSS when opening malicious image in new browser tabEPSS 0.7%CVE-2026-42557HIGHjupyterlab: Command linker attributes in HTML enable one-click command execution from untrusted contentEPSS 0.7%CVE-2024-22421HIGHPotential authentication and CSRF tokens leak in JupyterLabEPSS 0.7%
References
https://github.com/jupyterlab/jupyterlab/commit/1a10a7da5ff655849b21581c2633b46483ae0be9https://github.com/jupyterlab/jupyterlab/commit/7f9f29e29e0c83fb17b0f11da57d06b3c6a40d96https://github.com/jupyterlab/jupyterlab/commit/cf6e89a8d315c4134cefa50c220bca296da466a7https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-6966-vjj6-99xv