CVE-2019-11701
The default webcal: protocol handler will load a web site vulnerable to cross-site scripting (XSS) attacks. This default was left in place as a legacy feature and has now been removed. *Note: this issue only affects users with an account on the vulnerable service. Other users are unaffected.*. This vulnerability affects Firefox < 67. Date published : 2019-07-23 https://bugzilla.mozilla.org/show_bug.cgi?id=1518627