CVE-2026-6658

A flaw was found in nbconvert. This vulnerability allows a remote attacker to perform Cross-site Scripting XSS by injecting arbitrary HTML or JavaScript code. This occurs due to unsanitized text/vnd.mermaid output in HTML exports, where the datamermaid block directly renders cell output without...

EUVD-2026-39642

A vulnerability in jupyter/nbconvert versions 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...

CVE-2026-6658

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 datamermaid block in share/templates/lab/base.html.j2 renders text/vnd.mermaid cell output directly into HTML without escaping, enabling attacker...