In the Apps settings section (vk.com/settings?act=apps) you can view all connected sites and apps. You can remove all unnecessary authorizations or edit their access settings.
Authorization is the process of giving the app access to your VK account data. This is required for the interaction of functional possibilities of the app and site.
If there are strange IP addresses in your activity history, check the Apps settings section to see if there are any strange authorized apps there.
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