XSS in Gohugo Hugo
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Gohugo Hugo
- Gohugoio Hugo — versions >= 0.60.0, < 0.163.3
Weakness classification (CWE)
References
- github.com/gohugoio/hugo/security/advisories/GHSA-q76j-gcg9-vxc6 (Vendor Advisory)
- github.com/gohugoio/hugo/pull/15051 (Issue Tracking)
- github.com/gohugoio/hugo/commit/ce1a7e0bce3713af40496ded3c2c0ceeed49231d (Patch)
- github.com/gohugoio/hugo/releases/tag/v0.163.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-58402?
- CVE-2026-58402 is a medium-severity vulnerability in Gohugo Hugo, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-06.
- How severe is CVE-2026-58402?
- Medium severity. CVSS v3 base score is 5.4 out of 10.