CVE-2018-18509

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren’t covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1. Date published : 2019-04-26 http://seclists.org/fulldisclosure/2019/Apr/38

http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html