CVE-2026-58402
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Hugo
PublishedJul 6, 2026
First seenJul 6, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- gohugo hugo0.163.3 or later
- github.com/gohugoio/hugo0.163.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| gohugo hugo | 0.60.0 ≤ v < 0.163.3 | 0.163.3 |
| github.com/gohugoio/hugoGo | 0.60.0 ≤ v < 0.163.3 | 0.163.3 |
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