Bug 2541895 (CVE-2026-100691) - CVE-2026-100691 github.com/gohugoio/hugo: Hugo: Stored cross-site scripting via unescaped lineAnchors option
Summary: CVE-2026-100691 github.com/gohugoio/hugo: Hugo: Stored cross-site scripting v...
Keywords:
Status: NEW
Alias: CVE-2026-100691
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-26 13:41 UTC by OSIDB Bzimport
Modified: 2026-09-28 13:33 UTC (History)
14 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-26 13:41:04 UTC
Hugo versions 0.75.0 through 0.165.x contain a stored cross-site scripting vulnerability: the syntax highlighter does not escape the `lineAnchors` option before passing it to Chroma, which writes the value verbatim into the `id` and `href` attributes of the generated line-number markup. A crafted `lineAnchors` value supplied as a Markdown code fence attribute (or passed to the `highlight` template function) results in unescaped HTML in the rendered page, allowing arbitrary JavaScript to execute in the browsers of visitors to the generated site. This affects sites that build and publish Markdown from untrusted contributors; Hugo's security model otherwise considers content trusted input. Fixed in 0.166.0, where the `lineAnchors` value is HTML-escaped before being passed to Chroma.


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