An attacker could obtain the token from the browser's history. Note that this means the attacker needs access to the particular device.
OAuth 2.0 Threat Model and Security Considerations (RFC6819, section 4.4.2.2)
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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