XSS in Gohugoio Hugo
CVE-2026-109597
Hugo from v0.60.0 before v0.167.0 contains a stored cross-site scripting vulnerability that allows Markdown content authors to inject HTML by supplying crafted explicit heading IDs. Attackers can break out of the unescaped href attribute in .TableOfContents or .Fragments.ToHTML output to inject elements with event handlers into rendered pages.
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
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/gohugoio/hugo/security/advisories/GHSA-wcpj-vcvm-j4pg (vendor-advisory)
- www.vulncheck.com/advisories/hugo-0.60.0-before-0.167.0-stored-xss-via-table-of… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109597?
- CVE-2026-109597 is a medium-severity vulnerability in Gohugoio Hugo, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-12.
- How severe is CVE-2026-109597?
- Medium severity. CVSS v3 base score is 5.4 out of 10.