Contact Form 7 Datepicker plugin
Vulnerability Leads to Closure of Plugin with Over 100,000 Installations. On April 1, 2020, the Threat Intelligence team discovered a stored Cross Site Scripting (XSS) vulnerability in Contact Form 7 Datepicker, a WordPress plugin installed on over 100,000 sites. As the plugin developer’s github page indicated that the plugin was no longer being maintained, we contacted the WordPress plugins team with our disclosure, and they immediately removed the plugin from the repository for review. We also contacted the plugin’s developer and received a response verifying that they had no plans to maintain it and were satisfied with removing the plugin from the repository.
We strongly recommend deactivating and removing this plugin.
What should I do?
We strongly recommend deactivating and removing the Contact Form 7 Datepicker plugin if it is installed on your site. As the Contact Form 7 Datepicker plugin is no longer being maintained, it will likely not ever be patched, so it may be wise to search for an alternative plugin with similar functionality.
Due to the number of sites affected by this plugin’s closure, we are intentionally providing minimal details about this vulnerability to prevent widespread exploitation. We will continue to monitor the situation and provide more details in a future update.