Fortinet's FortiGuard Labs has discovered a cross-site scripting (XSS) vulnerability in WordPress Visual Composer Website Builder Plugin.
WordPress Visual Composer is a popular, free, fast, SEO-friendly website and landing page builder plugin. It's a most feature-rich free page builder - 50+ free elements, 10+ free landing page templates, and advanced design options with background and parallax effects.
The Visual Composer Website Builder plugin is vulnerable to Stored Cross-Site Scripting via the 'Text Block' feature due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with access to the visual composer editor to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
SolutionsFortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:
Released Aug 30, 2022
Users should apply the solution provided by Visual Composer Team.
Fortinet reported the vulnerability to Visual Composer Team on December 22, 2021
Visual Composer Team patched the vulnerability on January 4, 2022