### [CVE-2017-5387](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5387)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2051%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Disclosure%20of%20local%20file%20existence%20through%20TRACK%20tag%20error%20messages&color=brighgreen)

### Description

The existence of a specifically requested local file can be found due to the double firing of the "onerror" when the "source" attribute on a "<track>" tag refers to a file that does not exist if the source page is loaded locally. This vulnerability affects Firefox < 51.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1295023

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