firefox is vulnerable to spoofing. A vulnerability exists where the caret ^
character is improperly escaped. Constructing some URIs due to it being used as a separator allows for possible spoofing of origin attributes.
lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.html
lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.html
lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
access.redhat.com/errata/RHSA-2019:1763
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=1548306
lists.debian.org/debian-lts-announce/2019/08/msg00001.html
lists.debian.org/debian-lts-announce/2019/08/msg00002.html
security.gentoo.org/glsa/201908-12
security.gentoo.org/glsa/201908-20
www.mozilla.org/security/advisories/mfsa2019-21/
www.mozilla.org/security/advisories/mfsa2019-22/
www.mozilla.org/security/advisories/mfsa2019-23/