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A critical vulnerability has been found in Opera browser by security researcher Jordi Chancel. The vulnerability can be used by an attacker to execute arbitrary code on vulnerable machines.The bug affects the latest version of Opera running on Windows 7, as well as Windows XP SP3. The vulnerability was confirmed and released by a French Security firm VUPEN. The vulnerability exist in the current release of Opera i.e. 11.0 0 as well as in the previous release 10.63 and others.