A new security vulnerability has been discoverd on Java SE 10 and old versions. Java 7 Update 10 and earlier contain an unspecified vulnerability that can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. Now oracle fixed this issue and released latest version Java SE7 U11.
Even this vulnerability found now, it has been open since Java 7 Update 10 on last October 2012. If you have installed java on your system, you must update Java SE7 U11 now.
1. Goto control panel and Uninstall old version of java.
2. Goto Java.com and download latest java version and install it.
3. Restart your Browser.
Then security Vunerability will be fixed.
Watch this video:
This java update didn't fixed this issue.Oracle released new update 13. For more info, please read