U.S. CISA adds Microsoft Partner Center and Synacor Zimbra Collaboration Suite flaws to its Known Exploited Vulnerabilities catalog U.S. CISA adds Microsoft Partner Center and Synacor Zimbra Collaboration Suite flaws to its Known Exploited Vulnerabilities catU.S. CISA adds Microsoft Partner Center and Synacor Zimbra Collaboration Suite flaws to its Known Exploited Vulnerabilities catalog.securit..