Cross-site request forgery (CSRF) is a web-based attack whereby HTTP requests are transmitted from a user that the web site trusts or has authenticated. CSRF attacks on OAuth approvals can allow an attacker to obtain authorization to OAuth protected resources without the consent of the user.
OAuth 2.0 Threat Model and Security Considerations (RFC6819, section 4.4.1.8)
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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