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mozillaMozilla FoundationMFSA2015-37
HistoryMar 31, 2015 - 12:00 a.m.

CORS requests should not follow 30x redirections after preflight — Mozilla

2015-03-3100:00:00
Mozilla Foundation
www.mozilla.org
27

0.003 Low

EPSS

Percentile

71.0%

Mozilla developer Christoph Kerschbaumer discovered an issue while investigating Mozilla Foundation Security Advisory 2015-03, previously reported by security researcher Muneaki Nishimura. This flaw was that a cross-origin resource sharing (CORS) request should not follow 30x redirections after preflight according to the specification. This only affects sendBeacon() requests but could allow for a potential Cross-site request forgery (XSRF) attack from malicious websites.