Microsoft has released a jumbo-sized set of Patch Tuesday updates, including critical fixes for Windows and Internet Explorer (IE).
The Windows and IE updates are two of three critical fixes in the May Patch Tuesday. The third critical fix addresses flaws in Microsoft Font Drivers.
Microsoft said all three of the critical flaws could be remotely exploited by hackers.
"The most severe of the [IE] vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer," explained the advisory.
"The [Windows] vulnerabilities could allow remote code execution if a user opens a specially crafted Journal file.
"[The Drivers] update resolves vulnerabilities in Microsoft Windows, Microsoft .NET Framework, Microsoft Office, Microsoft Lync and Microsoft Silverlight. The most severe of the vulnerabilities could allow remote code execution."
The remaining 10 bulletins hold "important" rankings from Microsoft and address flaws in Windows, the Management Console file format, JScript and VBScript scripting engines, Windows Kernel, Service Control Manager, Silverlight, .NET Framework, SharePoint Server and Office.
The bulletins warn the flaws could be used by hackers for a variety of purposes including privilege escalation, denial-of-service attacks, security feature bypassing and information theft.
The news comes just after Microsoft revealed plans to drop its traditional monthly Patch Tuesday update cycle after the release of Windows 10.
The move will see Microsoft adopt a more dynamic update strategy that works in the background on Windows 10 devices.
The announcement of Patch Tuesday's demise caused some consternation in the security community, with many wondering how Microsoft will protect older versions of Windows in future.
"While providing patches immediately for admins is an excellent move on Microsoft's part, it leaves many questions still unanswered," explained Ziv Mador, vice president of security research at Trustwave.
"Will patches for older operating systems like Vista and Windows 8 receive patches at the same time as Windows 10? How will on-demand patches affect the Microsoft Active Protections Program (MAPP)?"
Microsoft is yet to give Windows 10 a firm release date outside a vague promise it will be sometime this summer.
For an overview of Windows 10 and its feature check out V3's Windows 10 technical preview hands on.
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