According to https://www.mailsploit.com/index , several E-Mail clients and Webmail clients are vulnerable against Mailsploit. There is a list of affected clients available, but not all are listed. I would like to know, if Roundcube is also affected or if it is not.
There have been problems found in Roundcube in the past, all known problems have been fixed so as long as your on a current version and maintain updates you should be fine.
Many thanks for the reply. In the meantime, I have found that there is a demo page at https://www.mailsploit.com/index. With this you, can send yourself a E-mail, which demonstrates in a somewhat relatively secure way the vulnerability in the mailclient of you're choice. I have seen that this test was not successful in Roundcube. So Roundcube seems to be safe.
BTW: Could you please answer my latest PM regarding the review of my Plugin?