If the client does not provide enough protection, an attacker or disgruntled employee could retrieve the passwords for a user.
OAuth 2.0 Threat Model and Security Considerations (RFC6819, section 4.4.3.1)
This threat is considered fully mitigated if all the test cases from the following test set succeed.
The impact factor is a measure that indicates how important a given countermeasure is towards mitigating a threat.
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