Microsoft today said it will address 22 vulnerabilities as part of next week's Patch Tuesday, three of which are critical.

Three of the 12 bulletin items released by Microsoft earlier today are classified as critical, and affect Microsoft's Windows operating system, with one affecting Microsoft's Internet Explorer browser as well. The rest are classified as "important."

In a post on Microsoft's Security Response Center blog, the company said it will be making fixes for vulnerabilities in the Windows Graphics Rendering Engine, as well as CSS exploit in Internet Explorer that could allow an attacker to gain remote code execution.

Along with the fixes for the rendering engine and the CSS exploit, Microsoft says it will be addressing zero-day flaws that created vulnerabilities in the FTP service found inside of Internet Information Services (IIS) 7.0 and 7.5.

Not included in this month's batch of announced patches is a fix for the recently-discovered script injection attacks that affect Internet Explorer. Acknowledged by the company last week in Security Advisory 2501696, the exploit targeted the way IE handled MHTML on certain types of Web pages and document objects, and could provide hackers with access to user information. According to Wolfgang Kandek, chief technology officer at Qualys, the best route to prevent those attacks continues to be the workaround Microsoft outlined in its initial security advisory about the problem.

Microsoft has a full list of the pending issues here.