Editors and Administrators can publish content with unfiltered HTML. Use this plugin to force filtering of HTML from Editors.
By default, users with Administrator or Editor privileges are allowed to publish unfiltered HTML in post titles and content. WordPress is, after all, a publishing tool, and people need to be able to include whatever markup they need to communicate. Users with lesser privileges are not allowed to post unfiltered content.
Use this plugin to prevent Editors from publishing unfiltered HTML posts. Administrators will not be affected.
For more information, check out the FAQ.