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CVE-2026-5389 - justhtml before 1.13.0 XSS via code fence breakout

CVE ID : CVE-2026-5389 Published : Aug. 23, 2026, 2:16 p. m. • 6 hours, 54 minutes ago Description : justhtml versions before 1. 13. 0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content. Attackers can place backticks inside sanitized pre elements to break out of fixed-length code fences, allowing raw HTML to execute when the generated Markdown is rendered by CommonMark or GFM-style renderers. Severity: 6.1 • MEDIUM Visit the link for more details, such as CVSS details, affected products, timeline, and more...

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