GHSA-q76j-gcg9-vxc6

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.