The glitzy, interactive abilities of Web 2.0 have led to a profusion of new applications, but the technology also is bringing a new era of security vulnerabilities, a security researcher warned Wednesday.

"Security was a challenge to begin with, but if anything it's getting harder in the Web 2.0 world," said Jacob West, manager of the security research group at Fortify, a company that helps companies make sure their software is secure.

A big culprit is JavaScript, a language that's widely used to control Web browsers and enable more sophisticated operations.

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