The Shield Security plugin for WordPress is vulnerable to stored Cross-Site Scripting in versions up to, and including, 17.0.17 via the 'User-Agent' header. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
WordPress Shield Security Smart Bot Blocking and Intrusion Prevention plugin versions 17.0.17 and below suffer from cross site scripting and missing authorization vulnerabilities.