What is the flaw?

What is wrong with that?

PayPal often blocks users for variety of reasons like preventing a fraudster from reaching illicitly obtained funds.

Authentication Flaw in PayPal mobile API lets users access blocked accounts

The most famous user blocked by PayPal.

The vulnerability was discovered byBenjamin Kunz Mejri from Vulnerability Laboratoryin 2013.

In the report of the glitch, Mejri says that version 4.6.0 of the PayPal iOS App is affected.

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After several attempts, the service requests the answer to a security question to validate the user.

No bounty has been paid for the discovery to Mejri by PayPal

Resource :Softpedia Security

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source: www.techworm.net