A flaw was found in Wildfly, where it returns an incorrect caller principal under certain heavily concurrent situations when Elytron Security is used. This flaw allows an attacker to gain improper access to information they should not have.

A flaw was found in Wildfly from version 11. The ElytronManagedThread in Elytron subsystem stores a SecurityIdentity to run the thread as. These threads do not necessarily terminate if the keep alive time has not expired. This could cause a shared thread to use the wrong security identity when executing.