It's not the "PHPSESSID" parameter - instead it's the "XTCsid" parameter which is vulnerable to a session fixation attack.
Workaround:
================
Update to xt:Commerce 3.0.4 SP 2.1
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It's not the "PHPSESSID" parameter - instead it's the "XTCsid" parameter which is vulnerable to a session fixation attack.
Workaround:
================
Update to xt:Commerce 3.0.4 SP 2.1