In a previous posting we had announced a security vulnerability in OAuth Core 1.0 (http://developer.yahoo.net/forum/index.php?showtopic=1263). To warn application users of the potential risk, Yahoo! took the step of applying a warning message within the OAuth user verification flow noting the risk of using an application built upon OAuth Core 1.0. This vulnerability was repaired in a revision to the library, OAuth Core 1.0 Revision A. All implementations of Pre-Rev A OAuth will stop working on Monday, November 9th and should be upgraded to the new standard by all application developers to complete the OAuth flow.