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 of the attribute and injects a live script element. This issue is fixed in 0.163.3.

• CWE-79

• https://github.com/gohugoio/hugo/commit/ce1a7e0bce3713af40496ded3c2c0ceeed49231dPatch
• https://github.com/gohugoio/hugo/pull/15051Issue Tracking
• https://github.com/gohugoio/hugo/releases/tag/v0.163.3Release Notes
• https://github.com/gohugoio/hugo/security/advisories/GHSA-q76j-gcg9-vxc6Vendor Advisory

Published

Jul 6, 2026

Last Modified

Jul 8, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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