Payment Plugins for Stripe WooCommerce vulnerabilities

The Payment Plugins for Stripe WooCommerce plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via '#response' URL Fragment in all versions up to and including 4.0.17 due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that the 'Generic Errors' setting is unchecked, causing getErrorMessage() to return the raw Stripe error string unchanged rather than substituting a mapped safe message.

The Payment Plugins for Stripe WooCommerce plugin before version 4.0.12 does not validate the order key before adding order data to the JavaScript configuration output on the front end. This allows unauthenticated users to obtain the billing details of any order, together with the secret that gates access to it, by iterating sequential order identifiers.

The Payment Plugins for Stripe WooCommerce plugin for WordPress up to version 4.0.7 fails to properly verify user authorization. An unauthenticated attacker can mark arbitrary pending WooCommerce orders as paid by forging a charge.pending event with attacker-controlled data, triggering payment_complete() and order fulfillment. The vulnerability is exploitable only when the webhook_secret_test or webhook_secret_live field is left blank (default).