The changelog for the latest version of Event Calendar WD indicates that some sort of cross-site scripting (XSS) vulnerability had been fixed, “Fixed: XSS vulnerabilities”. Looking at the changes made in that version various data is escaped before being output, but when we went to check this out what we found that was incompletely done.
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This post provides the details of a vulnerability in the WordPress plugin Event Calendar WD 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 its contents are limited to subscribers of our service. If you are not currently a subscriber, you can try out the service for free and then you can view the contents of the post. There are a lot of other reason that you will want to sign up beyond access to posts like this one, including that you would have already been warned about this vulnerability if your website was vulnerable due to it.