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Spring Security OAuth, versions 2.3 prior to 2.3.4, and 2.2 prior to 2.2.3, and 2.1 prior to 2.1.3, and 2.0 prior to 2.0.16, and older unsupported versions could be susceptible to a privilege escalation under certain conditions. A malicious user or attacker can craft a request to the approval endpoint that can modify the previously saved authorization request and lead to a privilege escalation on the subsequent approval. This scenario can happen if the application is configured to use a custom approval endpoint that declares
AuthorizationRequest as a controller method argument.
This vulnerability exposes applications that meet all of the following requirements:
AuthorizationRequestas a controller method argument
This vulnerability does not expose applications that:
Users of affected versions should apply the following mitigation:
There are no other mitigation steps required.
This issue was identified and responsibly reported by Alvaro Muñoz (@pwntester) from Micro Focus.
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