When manipulating user events in nested loops while opening a document through script, it is possible to trigger a potentially exploitable crash due to poor event handling. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.
https://www.mozilla.org/security/advisories/mfsa2018-28/
https://www.mozilla.org/security/advisories/mfsa2018-27/
https://www.mozilla.org/security/advisories/mfsa2018-26/
https://www.debian.org/security/2018/dsa-4337
https://www.debian.org/security/2018/dsa-4324
https://usn.ubuntu.com/3868-1/
https://usn.ubuntu.com/3801-1/
https://security.gentoo.org/glsa/201811-13
https://security.gentoo.org/glsa/201811-04
https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1492823
https://access.redhat.com/errata/RHSA-2018:3532
https://access.redhat.com/errata/RHSA-2018:3531
https://access.redhat.com/errata/RHSA-2018:3006
https://access.redhat.com/errata/RHSA-2018:3005
http://www.securitytracker.com/id/1041944