CVE-2026-43883: AVideo: IDOR in PayPalYPT Plugin Allows Any Authenticated User to Cancel Arbitrary PayPal Subscription Agreements

plugin/PayPalYPT/agreementCancel.json.php cancels a PayPal billing agreement using an attacker-supplied agreement parameter without verifying that the authenticated user owns the agreement. A low-privilege authenticated user who learns or obtains another user’s PayPal billing agreement ID can silently suspend the victim’s recurring subscription, causing revenue loss to the platform and loss of paid service to the victim.