As part of Microsoft's April Patch Tuesday release are 11 security updates that fix vulnerabilities ithat could allow remote code execution and escalation of privileges. These updates are for multiple Microsoft products including Internet Explorer, Microsoft Office, and Windows. For a full list of security updates released today you can view the Microsoft Security Bulletin Summary for April 2015.
Adobe also released critical security updates for Flash and recommend all users upgrade to Adobe Flash Player 18.104.22.168. These security updates resolve memory corruption vulnerabilities in Flash Player that could allow an attacker to take control of the affected system. As Flash is a common attack vector for exploit kits, it is strongly recommended that you immediately upgrade to the latest version.