Executive brief
YOOtheme Zoo is a content management extension for Joomla that allows users to create and organize custom content types. An unauthenticated attacker can inject malicious JavaScript into comment fields and user-controlled form elements, which is stored in the database and executed in the browsers of other users viewing the affected content. This could lead to session hijacking, credential theft, or defacement of site content.
Technical details
The vulnerability is a stored cross-site scripting (XSS) flaw in Zoo versions below 4.1.66. User-supplied input in comments and user-defined field elements is not properly sanitized or escaped before being stored and rendered. An unauthenticated attacker can craft malicious payloads that bypass input validation and are persisted in the database, then executed when other users view the affected content. The attack requires no authentication and can be triggered simply by submitting a comment or form via the web interface. A patch is available in Zoo 4.1.66 and later.
Affected products
- YOOtheme Zoo < 4.1.66
Timeline
- 2026-08-21: disclosed