The Stripe Payment Forms by WP Full Pay WordPress plugin before 8.5.1 does not verify that a subscription belongs to the customer bound to the requesting customer-portal session before acting on it, allowing a user with a confirmed portal session to cancel, reactivate or modify subscriptions belonging to other customers.
https://wpscan.com/vulnerability/b467131b-15e1-4d1e-9a6a-3ee6e8bd3722/