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Bug
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Resolution: Done
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Critical
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1.3.4.Final
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None
See: https://www.owasp.org/index.php/Session_Fixation
In JBossWeb, there was a system property to enable this behavior: org.apache.catalina.authenticator.AuthenticatorBase.CHANGE_SESSIONID_ON_AUTH
Undertow does not seem to have an equivalent. I don't see any reason not to always force a session ID change following successful authentication when HttpSession.isNew() returns false.