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Small businesses using Microsoft's Internet Explorer 7 (IE7) could be at risk from attacks from hackers, it has been claimed.

On Saturday, Micrsoft warned that as many as one in 500 users of its flagship internet browsing software could be exposed to the threat.

At first the unpatched flaw in the software was exploited by Trojan attacks but hackers are now using code on legitimate websites to get through the browsers' security.

A popular search engine in Taiwan is among the high-profile victims.

The problem is currently not remedied by software updates from Microsoft and it is suggested users attempt a workaround which involves disabling active scripting.

Users unable to do this can contact their IT support firm to ensure their computer systems are not compromised.

In related news, a study by security consultancy Chapin Information Services found that IE7 passed just five out of 21 security tests carried out by the firm, reports the Register.

Google's Chrome browser came last in terms of password security, passing just one of the 21 tests, the news provider states.

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