Multiple SQL injection vulnerabilities in admin/admin.php in Sphider 1.3.6 and earlier, Sphider Pro, and Sphider-plus allow remote attackers to execute arbitrary SQL commands via the (1) site_id or (2) url parameter.
The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.