One of the changelog entries for the latest version of Tidio Chat is “Use nonce system”. That isn’t something you want to see in a changelog, since it would seem to indicate the plugin, which has 60,000+ installs, has been lacking protection against cross-site request forgery (CSRF). Looking at the changes made in that version that turned out to be the case with three AJAX accessible functions. What seems like it would be of most concern with that is that the plugin’s public and private keys could be changed through that.

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This post provides insights on a vulnerability in the WordPress plugin Tidio Chat 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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