The changelog for the latest version of Cache-Control is “Improved security.” Looking at the changes made we found that it fixed a cross-site request forgery (CSRF)/settings change vulnerability, though also breaks access to the admin area of WordPress.

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This post provides insights on a vulnerability in the WordPress plugin Cache-Control 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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