EFAIL
WIKIMEDIA DISAMBIGUATION PAGE
CVE-2017-17688; CVE-2017-17689; Efail (security vulnerability)
Efail, also written EFAIL, is a security hole in email systems with which content can be transmitted in encrypted form. This gap allows attackers to access the decrypted content of an email if it contains active content like HTML or JavaScript, or if loading of external content has been enabled in the client.