PickPlugins Question Answer <= 1.2.73 - Unauthenticated SQL Injection via 'id' Parameter

The PickPlugins Question Answer plugin for WordPress is vulnerable to SQL Injection in versions up to and including 1.2.73. This is due to insufficient sanitization of user-supplied input via the 'id' GET parameter in the user profile template combined with the use of wp_unslash() which removes WordPress's magic quotes protection, followed by direct concatenation into a SQL query without proper escaping or prepared statements in the qa_user_profile_card() function. This makes it possible for unauthenticated attackers to append additional SQL queries into existing queries, which can be used to extract sensitive information from the database.