CVE-2026-100691: medium-severity vulnerability in gohugoio hugo
Hugo before 0.166.0 Stored XSS via lineAnchors code block option
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.1epss 0.2%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
gohugoio · hugoRelated CVEs — gohugoio hugo
In the same product, most dangerous first.
CVE-2020-26284HIGHHugo can execute a binary from the current directory on WindowsEPSS 1.5%CVE-2024-55601MEDIUMHugo does not escape some attributes in internal templatesEPSS 0.6%CVE-2026-89259CRITICALHugo before v0.165.0 Insufficient Permission Restriction via TailwindCSSEPSS 0.6%CVE-2024-32875MEDIUMHugo doesn't escape markdown title in internal render hooksEPSS 0.5%CVE-2026-58403MEDIUMHugo symlink confinement bypass in os.ReadFileEPSS 0.5%CVE-2026-89258CRITICALHugo before v0.165.0 Symlink Confinement Bypass via resources.GetEPSS 0.5%