CVE-2026-52841

Beschreibung

Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, `Google::oauth` at `application/controllers/Google.php:278` stores its URL-supplied `provider_id` in the session, and `oauth_callback` 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 a peer provider-s Google sync to a Google account they control. The peer-s appointments then sync into the attacker-s calendar with each customer-s name and email attached as attendee data. Version 1.6.0 patches the issue.