Roundcube before 1.3.17 and 1.4.x before 1.4.12 is prone to XSS in handling an attachment's filename extension when displaying a MIME type warning message.
{
"severity": "Medium",
"cpes": [
"cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*"
]
}