gohugoio Hugo up to 0.165.x cross site scripting

Summaryinfo

A vulnerability was found in gohugoio Hugo up to 0.165.x. It has been classified as problematic. This affects an unknown function. This manipulation causes cross site scripting. This vulnerability is tracked as CVE-2026-100694. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in gohugoio Hugo up to 0.165.x and classified as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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 = ['.*'].

The advisory is shared at github.com. This vulnerability is known as CVE-2026-100694 since 09/26/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 0.166.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• gohugoio

Name

• Hugo

Version

• 0.165

Website

• Product: https://github.com/gohugoio/hugo/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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