Authorization Bypass Through User-Controlled Key
Magento versions through 2.3.6, 2.4.0 through 2.4.0-p1, and 2.4.1 are vulnerable to an insecure direct object vulnerability (IDOR) in the customer API module. Successful exploitation could lead to sensitive information disclosure and update arbitrary information on another user's account.
CWE-639 - Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.