Omnispace Agora Project before 26.10.0 contains a second-order SQL injection vulnerability that allows authenticated attackers to inject malicious SQL via the _idCategoryFilter parameter, which is persisted into the session and later concatenated into a SQL statement without parameterization. Attackers can store a malicious payload that executes when the filter is subsequently applied in app/Common/MdlCategory.php, leading to unauthorized database access or manipulation.