It doesn’t seem like a great sign for the security of WordPress plugins in the Plugin Directory to see that the head of the team in charge of that is having to update their plugin due to a security issue that involves a rather basic security failure. That happened recently with the plugin Register IPs where one of the changelog entries for the latest version is “Sanitize and escape IP address (props @juliobox)”. Looking at the changes made showed that there was previously a persistent cross-site scripting (XSS) vulnerability in the plugin.

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This post provides insights on a vulnerability in the WordPress plugin Register IPs 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.

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