Update: The BBC is reporting that Ubisoft has rushed to patch the exploit unearthed by a Google engineer in its Uplay DRM. The company also issued instructions for Uplay users:
"We recommend that all Uplay users update their Uplay PC application without a Web browser open," Ubisoft said. "This will allow the plug-in to update correctly. An updated version of the Uplay PC installer with the patch also is available from Uplay.com."