### [CVE-2019-11739](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11739)
![](https://img.shields.io/static/v1?label=Product&message=Thunderbird&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2068.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Covert%20Content%20Attack%20on%20S%2FMIME%20encryption%20using%20a%20crafted%20multipart%2Falternative%20message&color=brighgreen)

### Description

Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 68.1 and Thunderbird < 60.9.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1571481
- https://www.mozilla.org/security/advisories/mfsa2019-29/

#### Github
No PoCs found on GitHub currently.