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Parallels Plesk Panel 9.5.2 is compatible with Parallels Virtuozzo Containers 4.6.
http://www.parallels.com/products/plesk/download/thank-you
http://www.parallels.com/download/plesk/templates/
We have published Security Update #3 for Parallels Plesk Panel 9.3.0 that fixes PHP fasCGI vulnerability:
[-] An unauthenticated remote attacker being able to compromise the system and gain control over it security issues were resolved.