Microsoft's Patch Tuesday update for July will include fixes for three critical vulnerabilities, including the zero-day flaw in Windows Help and Support Center discovered by a Google researcher.
The July patch release will be relatively light compared to the June update which patched 34 flaws, but Microsoft said in its advance notification that the majority of the patches will require a system restart.
Alan Bentley, senior vice president of international sales at security firm Lumension, warned that that the bulletins address some serious issues.
"IT departments with Windows 7 and/or Windows 2008 R2 should be prepared to prioritise this bulletin," he said.
"The good news is that, with the release of these four bulletins next week, Microsoft will address the Help Center, Windows XP and Server 2003 vulnerabilities that have been under attack for a few weeks."
Wolfgang Kandek, chief technology office at Qualys, agreed that the need to update is pressing, and reminded companies that some enterprise systems may be coming to the end of their support period.
"July also marks the end of support for two important Microsoft operating systems, Windows XP SP2 and Windows 2000. Windows XP SP2 users are advised to upgrade to SP3, which will be supported through to 2014," he said.
"Windows 2000 users need to upgrade to a different version of the operating system altogether as the entire Windows 2000 line is discontinued."
The zero-day Help Center flaw could allow a malicious user to install a Trojan on a victim's machine and gain control of the system.
Microsoft's handling of the incident, and others like it, led to a campaign to publicly disclose security vulnerabilities in the company's products.
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