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Does WordPress apply any kind of data sanitization for its post content when saving it from admin area? (like stripping <script> tags) Or all it does is checks for some user capability (like current_user_can('edit_posts')?

I'm asking, because I'm making widget plugin:

  • It allows to add or edit HTML content which will be later shown of frontend .
  • It can be edited by site administrator or editor.
  • HTML content can have any structure, can contain script tags and can contain any attributes. So doing wp_kses isn't an option.

My question is, how safe is it do this without any kind of sanitization? (besides checking for current_user_can).

  • WordPress uses sanitize_post() internally – kero Oct 19 '17 at 15:34
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    There's a capability designed to allow users to add any HTML, including scripts. It's unfiltered_html. That would be the one to check when sanitizing. – Jacob Peattie Oct 20 '17 at 5:15
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Safe against/for what? Is "a legitimate user can input any HTML" a safety issue?

If you might handle data from kind-of-but-not-really trusted users, how about giving admins the possibility to define which tags/attributes to strip out (optionally: per user group / role) and your plugin does the rest, or run the content through a filter where they can implement their own logic with add_filter?

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