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CVE PROGRAM SOURCE RECORD5.1 Medium

CVE-2026-58402

Hugo default code block renderer XSS via unescaped code-fence language

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

gohugoio hugo

  • >= 0.60.0, < 0.163.3affected

References