Medium5.4Red Hat Linux Updated
Cross-site Scripting via unsanitized Mermaid output in HTML exports
CVE-2026-6658 Published Jun 26, 2026Updated by vendor Jun 26, 2026
Affected products & platforms
Red Hat LinuxUnclassified
Summary
Cross-site Scripting via unsanitized Mermaid output in HTML exports. Red Hat rates this moderate (CVSS 5.4). Weakness: CWE-79.
Mitigation checklist
Recommended fix / mitigation
- Users should avoid exporting or viewing untrusted notebooks as HTML to prevent the execution of arbitrary JavaScript.
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
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