Mozilla · Firefox · CVE-2014-8638
**Name of the Vulnerable Software and Affected Versions**
Mozilla Firefox versions prior to 35.0
Firefox ESR versions 31.x prior to 31.4
Thunderbird versions prior to 31.4
SeaMonkey versions prior to 2.32
**Description**
The issue allows remote attackers to bypass intended CORS access-control checks and conduct cross-site request forgery (CSRF) attacks via a crafted web site, due to the omission of the CORS Origin header in the navigator.sendBeacon implementation.
**Recommendations**
For Mozilla Firefox versions prior to 35.0, update to version 35.0 or later.
For Firefox ESR versions 31.x prior to 31.4, update to version 31.4 or later.
For Thunderbird versions prior to 31.4, update to version 31.4 or later.
For SeaMonkey versions prior to 2.32, update to version 2.32 or later.