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

Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding render: fullinfostring: true are enabled, t...

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

Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding render: fullinfostring: true are enabled, t...

CVE-2026-53427

The CVE-2026-53427 issue is a cross-site scripting vulnerability in leandrocp MDEx exposed via Markdown rendering. When render: full_info_string is enabled, the Lumis adapter copies a code fence’s highlight_lines_class info-string into per-line HTML class attributes, parsing key=value pairs via s...

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

Summary Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding render: \full\info\string: true\ ar...

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

Improper Neutralization of Input During Web Page Generation 'Cross-site Scripting' vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding render: fullinfostring: true are enabled, t...

PT-2026-55979

Name of the Vulnerable Software and Affected Versions Hugo versions 0.60.0 through 0.163.2 Description The default code-block renderer fails to perform HTML escaping when writing the Markdown code-fence language or info-string into the code element's class and data-lang attributes. An attacker ca...

GHSA-5VP3-3CG6-2RQ3 JustHTML is vulnerable to XSS via code fence breakout in <pre> content

Summary tomarkdown is vulnerable when serializing attacker-controlled content. The handler emits a fixed three-backtick fenced code block, but writes decoded text content into that fence without choosing a delimiter longer than any backtick run inside the content. An attacker can place backticks...

JustHTML is vulnerable to XSS via code fence breakout in <pre> content

Summary tomarkdown is vulnerable when serializing attacker-controlled content. The handler emits a fixed three-backtick fenced code block, but writes decoded text content into that fence without choosing a delimiter longer than any backtick run inside the content. An attacker can place backticks...