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www.developer.joomla.org/security-centre.html
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www.wordpress.org/news/category/security/
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www.typo3.org/news/security-bulletins/
Drupal
www.drupal.org/security
PrestaShop
www.prestashop.com/blog/en/category/prestashop-news/
XT-Commerce
www.xt-commerce.com/blog/