Which type of privilege escalation refers to accessing content of functions that are reserved for a specific user that has the same access level as the compromised account?

Authorization creep

Vertical privilege escalation

Lateral privilege escalation

Horizontal privilege escalation

Explanation

Horizontal privilege escalation occurs when an application allows the attacker to gain access to resources which normally would have been protected from an application or user. The result is that the application performs actions with the same but different security context than intended by the application developer or system administrator; this is effectively a limited form of privilege escalation (specifically, the unauthorized assumption of the capability of impersonating other users). https://en.wikipedia.org/wiki/Privilege_escalation