An attacker may try to guess valid refresh token values and send it using the grant type 'refresh_token' in order to obtain a valid access token.
OAuth 2.0 Threat Model and Security Considerations (RFC6819, section 4.5.3)
This threat is considered fully mitigated if all the test cases from one of the following test sets succeed.
The impact factor is a measure that indicates how important a given countermeasure is towards mitigating a threat.
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