PT-2026-55979 · Gohugoio · Hugo

K0Ngj1 · Published 2026-07-06 · Updated 2026-07-06 · CVE-2026-58402

Mitre

CVSS v4.0

5.1

Medium

Base vector

AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-58402

Affected Products

Hugo

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-58402 · Security Note
• https://github.com/gohugoio/hugo/commit/ce1a7e0bce3713af40496ded3c2c0ceeed49231d · Note
• https://github.com/gohugoio/hugo/releases/tag/v0.163.3 · Note
• https://github.com/gohugoio/hugo/pull/15051 · Note
• https://github.com/gohugoio/hugo/security/advisories/GHSA-q76j-gcg9-vxc6 · Note