Simple Security <= 1.1.5 - Authenticated Stored Cross-Site Scripting

The Simple Security plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'datefilter' parameter found on the access_log page to wp-admin/users.php and the 'simple_security_ip_blacklist[]' parameter found in the add_blacklist_ip action on the ip_blacklist page to wp-admin/users.php in versions up to, and including, 1.1.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.