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6 changes: 3 additions & 3 deletions attacks-and-mitigations.md
Original file line number Diff line number Diff line change
Expand Up @@ -172,9 +172,9 @@ fragment and obtain the access token.

The complexity of implementing and managing pattern matching correctly obviously
causes security issues. This document therefore advises to simplify the required
logic and configuration by using exact redirect URI matching. This means
the authorization server MUST compare the two URIs using simple string
comparison as defined in [@!RFC3986], Section 6.2.1. The only exception are
logic and configuration by using exact redirect URI matching. This means the
authorization server MUST ensure that the two URIs are equal, see [@!RFC3986],
Section 6.2.1, Simple String Comparison, for details. The only exception are
native apps using a `localhost` URI: In this case, the AS MUST allow variable
port numbers as described in [@!RFC8252], Section 7.3.

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