cvedb.io
CVE-2026-40171
UNKNOWN · CVSS n/a
EPSS exploitation probability: 0%
Published 2026-05-06T20:16:31.857 · Last modified 2026-06-17T10:44:48.747

Summary

In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click. An attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.