### [CVE-2017-7770](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7770)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=unspecified%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Addressbar%20spoofing%20with%20JavaScript%20events%20and%20fullscreen%20mode&color=brightgreen)

### Description

A mechanism where when a new tab is loaded through JavaScript events, if fullscreen mode is then entered, the addressbar will not be rendered. This would allow a malicious site to displayed a spoofed addressbar, showing the location of an arbitrary website instead of the one loaded. Note: this issue only affects Firefox for Android. Desktop Firefox is unaffected. This vulnerability affects Firefox < 54.

### POC

#### Reference
- https://www.mozilla.org/security/advisories/mfsa2017-15/

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