Hugo XSS and JS Template Context Vulnerability Analysis (CVE-2026-39826/CVE-2026-39823)

Vulnerability Overview In Hugo v0.162.0, the following security vulnerabilities exist: 1. XSS Vulnerability: - Description: Within , two vulnerabilities exist where an escape bypass may lead to Cross-Site Scripting (XSS). - CVE Numbers: CVE-2026-39826 & CVE-2026-39823 2. JS Template Literal Context Mis-tracking: - Description: In , the JS template literal context is incorrectly tracked across template branches, which may result in improper content escaping. Affected Scope Affected Versions: Hugo 1.26.1 to 1.26.3 Specific Impact: - The XSS vulnerability may allow attackers to execute cross-site scripting attacks by injecting malicious scripts. - Mis-tracking of the JS template literal context may lead to incorrect content escaping, subsequently causing security issues. Remediation 1. Upgrade Hugo Version: - Upgrade to Hugo 1.26.3 or later to fix the aforementioned security vulnerabilities. 2. Configuration Adjustments: - Disable default text/html content files: - By default, content files are now disabled. The new policy restricts which content media types can be used for pages under . Sites relying on manually authored or adapter-generated HTML content can re-enable this via . - Re-evaluate : - Re-check with every redirect in . - Reject symbolic link entries in : - Reject symbolic link entries within . POC Code or Exploit Code No specific POC code or exploit code is provided. Summary Two major security vulnerabilities exist in Hugo v0.162.0: an XSS vulnerability and an issue with JS template literal context mis-tracking. It is recommended that users upgrade to Hugo 1.26.3 or a later version and adjust configurations as needed to enhance security.

Goal Reached Thanks to every supporter — we hit 100%!

Hugo XSS and JS Template Context Vulnerability Analysis (CVE-2026-39826/CVE-2026-39823)

More from this source