Unspecified vulnerability in Java Web Start (JWS) and Java Plug-in with Sun JDK and JRE 6 Update 10 and earlier; JDK and JRE 5.0 Update 16 and earlier; and SDK and JRE 1.4.2_18 and earlier allows "hidden code" to make unauthorized network connections and "hijack HTTP sessions using cookies stored in the browser" via unknown vectors.

More... (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-5343)