I'm working on open-source application "Project-Open" and during the scanning I got the following vulnerability:
[Medium] Session Identifier Not Updated
Issue: 13800882
Severity: Medium
URL: https://<server_name>/register/
Risk(s): It is possible to steal or manipulate customer session and cookies, which might be used to impersonate a legitimate user,allowing the hacker to view or alter user records, and to perform transactions as that user
Fix: Do not accept externally created session identifiers
though the fix is mentioned but it is not sufficient for me to understand it completely.please guide me how should I remove this.Also let me know if any further details are needed to understand the question. P.S. the code is in tcl