cve/2023/CVE-2023-4053.md

### [CVE-2023-4053](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4053)
![](https://img.shields.io/static/v1?label=Product&message=Firefox%20ESR&color=blue)
![](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=unspecified%3C%20115.2%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=unspecified%3C%20116%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Full%20screen%20notification%20obscured%20by%20external%20program&color=brighgreen)

### Description

A website could have obscured the full screen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 116, Firefox ESR < 115.2, and Thunderbird < 115.2.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1839079

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