Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109597Hugo v0.60.0 before v0.167.0 Stored XSS via Table of Contents Heading IDs

Medium 5.4

In plain English

A medium-severity cross-site scripting in hugo from gohugoio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 93.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	hugo	no fix listed	DEBIAN-CVE-2026-109597
Debian:13	hugo	no fix listed	DEBIAN-CVE-2026-109597
Debian:14	hugo	0.167.0-1	DEBIAN-CVE-2026-109597
Ubuntu:22.04:LTS	hugo	no fix listed	UBUNTU-CVE-2026-109597
Ubuntu:26.04:LTS	hugo	no fix listed	UBUNTU-CVE-2026-109597
Ubuntu:26.10	hugo	no fix listed	UBUNTU-CVE-2026-109597

Affected products (as reported)

Vendor	Product	Versions
gohugoio	hugo	0.60.0 – before 0.167.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-wcpj-vcvm-j4pg) vendor-advisory
VulnCheck Advisory: Hugo v0.60.0 before v0.167.0 Stored XSS via Table of Contents Heading IDs third-party-advisory