GO-2026-5569 Hugo: XSS via unescaped code-fence language in default code block renderer in github.com/gohugoio/hugo

Hugo: XSS via unescaped code-fence language in default code block renderer in github.com/gohugoio/hugo...

github.com/gohugoio/hugo: Hugo: Cross-site Scripting via unescaped code-fence language in default code block renderer

A flaw was found in Hugo, a static site generator. The default code-block renderer failed to properly escape Markdown code-fence language or info-strings. This vulnerability allows an attacker to inject malicious script elements into web pages, leading to Cross-site Scripting XSS. Successful...

CVE-2026-58402

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...

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

Hugo's default code-block renderer wrote the Markdown code-fence language / info-string into the wrapper without HTML escaping. A fence info-string containing a quote and a payload breaks out of the attribute and injects a live script element. This is not an issue if you fully trust every file...