Security Advisory

CVE-2026-6658

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-26 09:40:30

Last updated 2026-06-26 10:19:12

Assigner @huntr_ai

CVSS score 5.4

State PUBLISHED

Description

A vulnerability in jupyter/nbconvert versions <= 7.17.0 allows for Cross-site Scripting (XSS) via unsanitized `text/vnd.mermaid` output in HTML exports. The `data_mermaid` block in `share/templates/lab/base.html.j2` renders `text/vnd.mermaid` cell output directly into HTML without escaping, enabling attackers to inject arbitrary HTML/JavaScript by breaking out of the `<pre>` tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export.

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