| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | = 31.0= 31.1.0= 31.1.1= 31.3.0= 31.5.1= 31.5.2= 31.5.3≤ 36.0.4 | |
| firefox esr | = 31.1= 31.2= 31.3= 31.4= 31.5 | |
| thunderbird | ≤ 31.5 |
The navigator.sendBeacon implementation in Mozilla Firefox before 37.0, Firefox ESR 31.x before 31.6, and Thunderbird before 31.6 processes HTTP 30x status codes for redirects after a preflight request has occurred, which allows remote attackers to bypass intended CORS access-control checks and conduct cross-site request forgery (CSRF) attacks via a crafted web site, a similar issue to CVE-2014-8638.
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