Stripe Payment Forms by WP Full Pay < 8.5.5 - Cross-Customer Subscription Cancellation via IDOR

Description

The plugin does not verify that a subscription belongs to the customer bound to the requesting customer-portal session before cancelling it, allowing a user with a confirmed portal session to cancel subscriptions belonging to other customers.

Exploitation requires the attacker to know the target subscription's identifier, which is high-entropy and not enumerable through the plugin.