CVE-2018-19351: Jupyter Notebook

Medium severity, CVSS 6.1. EPSS: 1.5% chance of exploitation in the next 30 days.

Jupyter Notebook before 5.7.1 allows XSS via an untrusted notebook because nbconvert responses are considered to have the same origin as the notebook server. In other words, nbconvert endpoints can execute JavaScript with access to the server API. In notebook/nbconvert/handlers.py, NbconvertFileHandler and NbconvertPostHandler do not set a Content Security Policy to prevent this.

Affected products

• Jupyter Notebook: before 5.7.1 (fixed in 5.7.1)

Published 2018-11-18. Last modified 2026-06-17.