medium6.1
CVE-2026-5389
justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Justhtml | before 1.13.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.