Here are redirection links related to the security updates:

• The wsusscn2.cab file used by the Windows Update Agent API, the MIcrosoft Baseline Security Analyzer and the open source wsusoffline project to get a list of available and needed patches;
• An Excel worksheet with a list of superseded / active bulletins by products and the associated xml files in CVRF format for the latest ones

Another set of security-related data are worthwile:

• The list of Certificate Authorities trusted by any Windows Machine