firefox/thunderbird is vulnerable to arbitrary code execution. Insufficient vetting of parameters passed with the Prompt:Open
IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user’s computer.
access.redhat.com/errata/RHSA-2019:1604
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=1559858
security.gentoo.org/glsa/201908-12
www.mozilla.org/en-US/security/advisories/mfsa2019-18/
www.mozilla.org/en-US/security/advisories/mfsa2019-19/
www.mozilla.org/security/advisories/mfsa2019-19/
www.mozilla.org/security/advisories/mfsa2019-20/