Twig before 2.4.4 allows Server-Side Template Injection (SSTI) via the search search_key parameter. NOTE: the vendor points out that Twig itself is not a web application and states that it is the responsibility of web applications using Twig to properly wrap input to it
The default "basic" security setting' in config.php for TWIG webmail 2.7.4 and earlier stores cleartext usernames and passwords in cookies, which could allow attackers to obtain authentication information and gain privileges.