AIKIDO-2026-993827
jupyterlab is vulnerable to Cross-Site Scripting (XSS)
81
High Risk
This Affects:
jupyterlabTL;DR
JupyterLab's system clipboard paste path parses clipboard text as cell JSON and inserts the cells without clearing metadata.trusted, so a pasted payload can declare its own output as trusted. JupyterLab does not sanitize trusted output and runs the <script> elements it contains, so pasting the cell runs untrusted JavaScript in the JupyterLab origin. The fix strips the trusted flag from cells pasted through the system clipboard so their output is sanitized like any other externally sourced content.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you paste notebook cells from the system clipboard with useSystemClipboardForCells enabled.
Background info
jupyterlab is vulnerable to Cross-Site Scripting (XSS) in versions 4.5.0 - 4.5.10 and 4.6.0 - 4.6.3.
How to fix this
Upgrade the jupyterlab library to the patch version.
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