We have fixed a security vulnerability in Anti-Spam by CleanTalk for WordPress. The vulnerability in the plugin can still be exploited in versions till 6.11. You can see the changelog here.
You can check the current version of the plugin in the list of your installed plugins.
WordPress Console -> Plugins
In case you use one of these previous versions, please be sure to update the plugin to the latest stable version as soon as you read this post using our special guide.