Is session guessing attacks or accidental session collision a concern on EAP 6? - Red Hat Customer Portal

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Issue

Is session guessing attacks or accidental session collision a concern on EAP 6?
Let's say user1 logs in and then their session times out, but he leaves his browser open. Then user2 logs in after this and gets a sessionid; could user2 get user1's old sessionid? And then if user1 becomes active again, could he see user2's session data?
Or could a malicious user easily guess a valid in use session id?

Environment

JBoss Enterprise Application Platform (EAP) 6.x

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