JWT Signature is not Verified

An attacker might be able to tamper with the values inside the JWT token payload and escalate privileges, impersonate users, or trigger unintended application states that were meant to be prevented by the use of a tamper-proof token solution.

By exploiting this vulnerability, an attacker could alter the JWT payload to assign themselves higher privileges. For instance, consider a JWT where the original payload includes the role of a regular user, such as {"username": "joe", "role": "user"}. An attacker could modify this payload to {"username": "joe", "role": "admin"}, effectively granting themselves administrative privileges. This unauthorized escalation could allow the attacker to access sensitive administrative functions, manipulate user accounts, or change security settings.