This post is being moved to PowerExchange forums as this forum is dedicated for PowerCenter Express discussions.
Please follow the blog which also has a linked knowledge base article for more information on Heartbleed issue. You may also open a ticket with Informatica support.
Unless you have enabled SSL, PWX does not have any exposure.
PWX does not use SSL by default - you have to do quite a bit of configuration to make it use SSL.
Therefore, most PWX customers have no heartbleed exposure in PWX.