### [CVE-2018-5116](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5116)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2058%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=WebExtension%20ActiveTab%20permission%20allows%20cross-origin%20frame%20content%20access&color=brighgreen)

### Description

WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. This vulnerability affects Firefox < 58.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1396399

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