KMail since version 5.3.0 used a QWebEngine based viewer that had JavaScript enabled. HTML Mail contents were not sanitized for JavaScript and included code was executed.
2016-12-23T22:59:00.300
2025-04-12T10:46:40.837
Deferred
CVSSv3.0: 6.5 (MEDIUM)
AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4