Concrete5 CMS version 9.1.3 contains an XPath injection vulnerability that allows attackers to manipulate URL path parameters with malicious payloads. Attackers can flood the system with crafted requests to potentially extract internal content paths and system information.
The product uses external input to dynamically construct an XPath expression used to retrieve data from an XML database, but it does not neutralize or incorrectly neutralizes that input. This allows an attacker to control the structure of the query.