From the BBC:

Adobe has acknowledged a "critical" security flaw in its Reader, Acrobat and Flash Player software.

Adobe says the vulnerability potentially enables hackers to take control of affected computer systems.

Users running Windows, Macintosh or Linux might all be open to attack.

The company is working to fix the problem. In the meantime, users of Reader, Acrobat and Flash are advised to ensure their anti-virus software is up to date.

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