WordPress Forum Server plugin is prone to an SQL injection. This vulnerability exists because of failure in the "index.php" script to properly clean up user-supplied input in "search_max" variable and in the "/wp-content/plugins/forum-server/feed.php" script to properly sanitize user-supplied input in "topic" variable. It allows an attacker to modify data, alter queries to the application SQL database, compromise the access and application or exploit hidden vulnerabilities in the underlying database.
Update the plugin.
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