Bug 2497467 (CVE-2026-58402)

Summary: CVE-2026-58402 github.com/gohugoio/hugo: Hugo: Cross-site Scripting via unescaped code-fence language in default code block renderer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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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 exploitation could result in arbitrary code execution within a user's browser.
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Description OSIDB Bzimport 2026-07-06 20:02:55 UTC
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.