CWmike writes "About eight out of every 10 Web browsers run by consumers are vulnerable to attack by exploits of already-patched bugs, a security expert said Thursday. The poor state of browser patching stunned Wolfgang Kandek, CTO of Qualys, which presented data from the company's free BrowserCheck service Wednesday at RSA. 'I really thought it would be lower,' Kandek said. BrowserCheck scans Windows, Mac and Linux machines for vulnerable browsers, as well as up to 18 browser plug-ins, from Adobe's Flash to Windows Media Player. When browsers and plug-ins are tabulated together, between 90% and 65% of all consumer systems scanned with BrowserCheck since June 2010 reported at least one out-of-date component. In January 2011, about 80% of the machines were vulnerable. The most likely plug-in to require a patch: same as last year, Oracle's Java."