Upgrade 5.3 to 6.0 because of security bulletin?

[Post_ITS_Server_Team]

Hello

We have two HP SIM 5.3 SP1 (with all hotfixes) Servers in two different domains. On one SIM we manage about 750 Servers on the other one about 4000 Servers(Because of Firewall and Security issues we couldn't make 50% 50%). We started a few weeks ago a project to build two new more performant HPSIM 6.0 Servers but because of the big organization and lot of project milestones we will have the new ones not before end of august 2010 up and running.

Today I got the HP Security Bulletin HPSBMA02525 SSRT100083 which describes Remote Cross Site Scripting (XSS), Cross Site Request Forgery (CSRF) and Privilege Elevation!

My question is now: Should we upgrade the existing HP SIM Servers to 6.0? I'm afraid of that after the upgrade there will be problems or side effects and we cannot manage the ~5000 Servers anymore for a while...
What do you think about that?

Kind regards,
Ville