source: https://www.securityfocus.com/bid/24598/info Apple WebCore is prone to a cross-site scripting vulnerability because the application fails to properly sanitize user-supplied input. An attacker may exploit this issue by enticing victims into visiting a malicious website. The attacker may leverage this issue to execute arbitrary script code in an application using the affected framework (typically Safari). This may help the attacker steal cookie-based authentication credentials and launch other attacks. xmlhttp.setRequestHeader('Foo', 'baa\nHost: test\n'); The above request is treated as valid and results in: GET / HTTP/1.1 Accept-Encoding: gzip, deflate Accept-Language: en Foo: baa Host: test