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CVE-2026-53427 Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute

🗓️ 29 Jun 2026 18:50:17Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 2 Views

XSS in MDEx via unescaped code-fence highlight_lines_class allows HTML and JavaScript injection from Markdown.

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15 Jul 2026 01:49Current
6Medium risk
Vulners AI Score6
CVSS 42.3
EPSS0.00405
2