Adobe has fixed a vulnerability in its widely used document-viewing program Reader, but the firm is not revealing the details of the security flaw.
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Because of this, security analysts believe the flaw is serious, and that users should update their systems to the new version - version 8.1.2 - as soon as possible.
The flaw affects PDF documents, which have been at the centre of previous critical security threats involving Windows-based machines.
It is estimated that two-thirds of home users have the free Adobe Reader software on their desktops, to enable them to read PDF documents, so the implications of an unpatched machine could be severe.