CVE-2026-102831 JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard

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...

CVE-2026-102831

The JupyterLab environment is vulnerable to a Cross-site scripting (XSS) attack due to the system clipboard cell-paste path accepting attacker-controlled cell JSON without clearing the metadata.trusted field. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a...