Joomla!
.../configuration.php

WordPress
.../wp-config.php

Drupal
.../sites/default/settings.php

DLE
.../engine/data/dbconfig.php

NetCat
…/netcat/vars.inc.php 

Image CMS
…/application/config/config.php

1-C Bitrix
…/bitrix/php_interface/dbconn.php
Начиная с 14-й версии параметры подключения к базе также указаны в файле:
…/bitrix/.settings.php

phpBB
.../config.php

vBulletin
.../includes/config.php

Magento
.../app/etc/local.xml

CS-Cart
.../config.local.php

MODx
.../manager/includes/config.inc.php

vBulletin
.../includes/config.php 

Typo3
.../typo3conf/localconf.php

WebAsyst
…/kernel/wbs.xml 
…/dblist/КЛЮЧ_БАЗЫ_ДАННЫХ.xml

OpenCart
…/config.php
.../admin/config.php

 PrestaShop
…/config/settings.inc.php

ShopCMS
…/core/config/connect.inc.php

Shop-script
…/cfg/connect.inc.php

PHPShop
…/phpshop/inc/config.ini

Vii Engine
…/system/data/db.php

Modx Revo
…/core/config.core.php
…/manager/config.core.php
…/config.core.php
…/connectors/config.core.php

HostCMS
.../modules/core/config/database.php

где "..." - путь к файлам вашего сайта.