Improper Authentication vulnerability in Apache APISIX.

On a route using openid-connect plugin with remote introspection against an authorization server that serves multiple issuers, a token that introspects as active for one issuer may get accepted on a route restricted to another. This issue affects Apache APISIX: from 3.12.0 through 3.18.0.

Users are recommended to upgrade to version 3.19.0, which fixes the issue.