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Advisories

justhtml before 1.13.0 XSS via code fence breakout

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severity
medium
date
Affecting

  • justhtml >= 0, < 1.13.0

CWE
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVSS
5.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Credit
AlfinJ0se
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.

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