Which vulnerability is illustrated by Stella accessing unauthorized websites due to unrestricted rights?

The scenario describes Stella accessing unauthorized websites as a result of having unrestricted rights. This situation directly indicates the presence of open permissions, where users have excessive rights that allow them to access resources or functions that they should not be able to. Open permissions can lead to various security risks, including unauthorized access to sensitive information and potential exploitation of systems.

In this case, because Stella has unrestricted rights, she can navigate to websites that may not be appropriate for her role, thus exposing the organization to potential threats such as malware, phishing attacks, or leakage of sensitive data. Addressing this issue requires implementing the principle of least privilege, where users are granted the minimum level of access necessary for their job roles, ensuring that they cannot access unauthorized resources or sites.

In contrast, privilege escalation pertains to a scenario where a user gains elevated access to resources beyond their intended permissions, which isn't the core issue here. Weak passwords refer to poor password security practices that can lead to unauthorized access, while data leakage typically involves the accidental or intentional exposure of sensitive information. The situation described aligns most directly with the issue of open permissions.