By default, Joomla will emulate register_globals = on, to not brake backwards compatibility with older components, modules or plugins. This will cause the same security issues as using normal register_globals on. You can turn this off however.

Open globals.php located in the root of your joomla installation. Search for:

define( 'RG_EMULATION', 1 );

and change it to:

define( 'RG_EMULATION', 0 );

That should keep you a bit safer against attacks.

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