### [CVE-2017-5408](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5408)
![](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%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Cross-origin%20reading%20of%20video%20captions%20in%20violation%20of%20CORS&color=brightgreen)

### Description

Video files loaded video captions cross-origin without checking for the presence of CORS headers permitting such cross-origin use, leading to potential information disclosure for video captions. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

### POC

#### Reference
- https://www.mozilla.org/security/advisories/mfsa2017-05/

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