CVE-2026-58402 — Hugo default code block renderer XSS via unescaped code-fence language
Hugo is a static site generator. From 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or info-string into the code class="languag…
Published: 2026-07-06 · CVSS: 5.1 · CVSS 4.0
Hugo is a static site generator. From 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or 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 issue is fixed in 0.163.3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7