Cisco Systems has started to patch a critical vulnerability in its WebEx browser extension. The extension could allow attackers to remotely execute malicious code on computers. The vulnerability was found by Google security researcher Tavis Ormandy. The company released a patched version of the extension — 1.0.7 — for Google Chrome on Thursday. It is working on similar patches for the Internet Explorer and Mozilla Firefox versions. Users who have the extension installed should disable it until a fixed version is released for those browsers.”]