Now Oracle has a quick way to find users with detault password.

SQL> SELECT * FROM dba_users_with_defpwd;

And here is the output:

USERNAME
——————————
DIP
MDSYS
WK_TEST
CTXSYS
OLAPSYS
OUTLN
EXFSYS
SCOTT
MDDATA
ORDPLUGINS
ORDSYS
XDB
LBACSYS
SI_INFORMTN_SCHEMA
WMSYS