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