Some WordPress plugins have been compromised recently and hackers are actively targeting websites through them. They may allow hackers to take over your site, change content or add malicious or unwanted content. Beware.
Yellow Pencil Visual Theme Customizer
Yuzo Related Posts
Developers usually respond quickly and fix flaws in their plugins, but unless you are absolutely sure you have a fixed version, you should not be using it on your website. At the very least least disable it, but it is safer to delete it as well.
Problem plugins are deleted from wordpress.org/plugins and are only allowed back when they are known to be safe. Wait till your plugin re-appears before using it again.