One of the changelog entries for the latest version of the plugin WP Maintenance is “SECURITY UPDATE : Adding NONCE to forms”. Looking at the changes made in that version we found that referred to adding checks for nonces to prevent cross-site request forgery (CSRF) on the plugin’s admin pages. We found that on one of those pages the lack of that could previously lead to cross-site scripting (XSS) being able to occur.

...

---

This post provides insights on a vulnerability in the WordPress plugin WP Maintenance not discovered by us, where the discoverer hadn't provided the details needed for us to confirm the vulnerability while we were adding it to the data set for our service, so the rest of its contents are limited to subscribers of our service.

If you were using our service, you would have already been warned about this vulnerability if your website is vulnerable due to it. You can try out our service for free and then see the rest of the details of the vulnerability.

For existing customers, please log in to your account to view the rest of the contents of the post.