Everybody who is deploying his APEX application on Oracle XE should read that!
Just read a very interesting paper titled Best of Oracle Security 2006, which was brought to my attention by Pete Finnigan’s Oracle security weblog. It covers fixed security problems in Oracle DB, mod_plsql, APEX, … which you/or your DBA may should know of.
Too bad for the english speaking readers, it’s just available in german.
Be cautious if you use PL/SQL functions/packages in your SQL statements, especially in the Where-Clause!
Because the function is probably called more often than you think it is! If you don’t want to read the hole article, scroll down and check the APEX impact.