CVE-2019-10741

Name of the Vulnerable Software and Affected Versions K-9 Mail version 5.600

Description The issue allows an attacker to include the original quoted HTML code of a specially crafted email within reply messages. This can contain conditional statements that display different text when opened in a different email client. An attacker can exploit this to obtain valid S/MIME or PGP signatures for arbitrary content.

Recommendations For K-9 Mail version 5.600, at the moment, there is no information about a newer version that contains a fix for this vulnerability.