OpenSolution Quick.CMS < 6.7 and Quick.Cart < 6.7 allow an authenticated user to perform code injection (and consequently Remote Code Execution) via the input fields of the Language tab.
https://opensolution.org/security-fix-for-cart-and-cms%21-en-1136.html
https://opensolution.org/cms-system-quick-cms.html
http://packetstormsecurity.com/files/161189/Quick.CMS-6.7-Remote-Code-Execution.html