### [CVE-2017-5421](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5421)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Thunderbird&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2052%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Print%20preview%20spoofing&color=brighgreen)

### Description

A malicious site could spoof the contents of the print preview window if popup windows are enabled, resulting in user confusion of what site is currently loaded. This vulnerability affects Firefox < 52 and Thunderbird < 52.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1301876

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