Microsoft Security Bulletin Summary for May reports the release of two patches rated "critical", and one rated "moderate". An end-user version of this update summary is also available.
Microsoft Security Bulletin MS06-019 provides a critical patch for a vulnerability in Microsoft Exchange Server that could potentially allow for remote code execution on affected machines. Microsoft Security Bulletin MS06-020 provides a critical patch against a Flash vulnerability first reported in a Microsoft security advisory in march and reported here on f-prot.com in the March Security Summary. Adobe reported on this vulnerability in their own security bulletin in March.
Users are advised to patch their systems against these vulnerabilities immediately. Patches can be downloaded via links posted within the appropriate Security Bulletins and by visiting Microsoft Update.
Microsoft Security Updates Summary for May
Technical Summary of May Security Bulletins
Critical:
Moderate: