UNKNOWN Go
Hugo: XSS via unescaped code-fence language in default code block renderer
GHSA-q76j-gcg9-vxc6 · CVE-2026-58402
Published · Modified
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Description
Hugo's default code-block renderer wrote the Markdown code-fence language / info-string into the <code class="language-…" data-lang="…"> wrapper without HTML escaping. A fence info-string containing a quote and a <script> payload breaks out of the attribute and injects a live script element.
This is not an issue if you fully trust every file under /content and every content adapter you load.
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