GHSA-8HM4-R66F-29WR Easy!Appointments: Authorization bypass in Google OAuth provider binding lets any backend user rebind a peer provider's Google sync

Summary Google::oauth at application/controllers/Google.php:278 stores its URL-supplied providerid in the session, and oauthcallback saves the issued Google OAuth token against that row without checking the caller owns the provider. Any logged-in backend user admin, provider, or secretary rebinds...