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Cross-site Scripting (XSS) The advisory has been revoked - it doesn't affect any version of package jupyterlab  (opens in a new tab)

Threat Intelligence

EPSS
0.2% (9th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-JUPYTERLAB-20335606
  • published30 Sept 2026
  • disclosed29 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 29 Sep 2026

NewCVE-2026-102831  (opens in a new tab)
CWE-79  (opens in a new tab)
CWE-345  (opens in a new tab)

Amendment

The Debian security team deemed this advisory irrelevant for Debian:unstable.

NVD Description

Note: Versions mentioned in the description apply only to the upstream jupyterlab package and not the jupyterlab package as distributed by Debian.

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.