CORS Bypass Vulnerability in navigator.sendBeacon Implementation

CVE-2015-0807 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

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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