cve/2019/CVE-2019-11743.md

### [CVE-2019-11743](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11743)
![](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=%3C%2060.9%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2068.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2069%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Cross-origin%20access%20to%20unload%20event%20attributes&color=brighgreen)

### Description

Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

### POC

#### Reference
- https://www.mozilla.org/security/advisories/mfsa2019-29/

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