steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code via a modified HTTP request that sends a crafted e-mail message.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "1.1.6"
},
{
"introduced": "0"
},
{
"last_affected": "1.2.0"
},
{
"introduced": "0"
},
{
"last_affected": "1.2.1"
},
{
"introduced": "0"
},
{
"last_affected": "1.2.2"
}
]
}