Use of Insufficiently Random Values
CyberArk Identity versions up to and including 22.1 in the 'StartAuthentication' resource, exposes the response header 'X-CFY-TX-TM'. In certain configurations, that response header contains different, predictable value ranges which can be used to determine whether a user exists in the tenant.
CWE-330 - Use of Insufficiently Random Values
The software uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.