Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck
CVE-2026-100694Hugo before 0.166.0 Cross-Site Scripting via text/org
Medium 6.1
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 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Hugo is a static site generator. In versions from v0.56.0 through v0.165.x, content files mapped to the text/org media type are rendered without escaping raw HTML: Org export blocks and @@html:...@@ snippets pass HTML through unescaped, resulting in cross-site scripting (XSS) in the generated site. An attacker who can supply or influence a content file under /content or the output of a content adapter can inject scripts that execute in the browsers of visitors to the affected pages. Only pages whose source file or content-adapter output declares the text/org media type are affected, and sites that fully trust all content sources are not impacted. Version v0.166.0 fixes the issue by introducing a security.allowContent allowlist that denies text/org by default; sites that intentionally author Org Mode content can opt back in with [security] allowContent = ['.*'].
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | hugo | no fix listed | DEBIAN-CVE-2026-100694 |
| Debian:13 | hugo | no fix listed | DEBIAN-CVE-2026-100694 |
| Debian:14 | hugo | 0.166.0-1 | DEBIAN-CVE-2026-100694 |
| Ubuntu:22.04:LTS | hugo | no fix listed | UBUNTU-CVE-2026-100694 |
| Ubuntu:26.04:LTS | hugo | no fix listed | UBUNTU-CVE-2026-100694 |
| Ubuntu:26.10 | hugo | no fix listed | UBUNTU-CVE-2026-100694 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-pq74-mj4h-cjq2) vendor-advisory
- VulnCheck Advisory: Hugo before 0.166.0 Cross-Site Scripting via text/org third-party-advisory