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What is the purpose of OAuth 2.0 redirect_uri checking?

The OAuth 2.0 specification's authorization code mechanism includes redirect URI checking from the site you redirect to. See steps D and E in section 4.1 of the spec. Also, section 4.1.3 describes in ...
2
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1answer
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Android, how do I prevent Confused Deputy Attacks?

In case that a malicious mobile app hasn't the appropriate permissions to e.g. download a file, it can invoke a browser to download sth. Concrete examples of such an attack are shown from page 27 to ...