This is a duplicate of RHQ-491:
If the user knew the name of secured property such as 'principal' or 'credentials', they could get security information about the resources managed by JBoss ON. The fix to this was to filter out any results that deal with PASSWORD types of properties.
The issue affected JON 2.1.x and was fixed with JON 2.1.2 SP1.
*** This bug has been marked as a duplicate of bug 536105 ***