An issue was discovered in KDE KMail before 19.12.3. By using the proprietary (non-RFC6068) "mailto?attach=..." parameter, a website (or other source of mailto links) can make KMail attach local files to a composed email message without showing a warning to the user, as demonstrated by an attach=.bash_history value.
{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "19.12.3"
}
],
"source": "CPE_RANGE",
"cpe": "cpe:2.3:a:kde:kmail:*:*:*:*:*:*:*:*"
}