SQL injection vulnerability in index.php in the Quiz (com_quiz) 0.81 and earlier component for Mambo and Joomla! allows remote attackers to execute arbitrary SQL commands via the tid parameter in a user_tst_shw action.
Improper Neutralization of Special Elements used in an SQL Command 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.