cve/2018/CVE-2018-5135.md

### [CVE-2018-5135](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5135)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2059%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=WebExtension%20browserAction%20can%20inject%20scripts%20into%20unintended%20contexts&color=brighgreen)

### Description

WebExtensions can bypass normal restrictions in some circumstances and use "browser.tabs.executeScript" to inject scripts into contexts where this should not be allowed, such as pages from other WebExtensions or unprivileged "about:" pages. This vulnerability affects Firefox < 59.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1431371

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