Description
paypal-ipn before 3.0.0 uses the `test_ipn` parameter (which is set by the PayPal IPN simulator) to determine if it should use the production PayPal site or the sandbox. With a bit of time, an attacker could craft a request using the simulator that would fool any application which does not explicitly check for test_ipn in production.
Remediation
References
https://github.com/andzdroid/paypal-ipn/issues/11
https://nodesecurity.io/advisories/26
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