This advisory has been withdrawn because the CVE has been disputed and the underlying vulnerability is likely invalid. This link is maintained to preserve external references.
According to maintainers of Craft CMS, only administrators can access Settings, and those administrators may have business needs for their permissions. Additionally, the underlying issue likely has little to no real-world security impact.
CraftCMS is vulnerable to Server-Side Template Injection (SSTI). An authenticated attacker can inject Twig Template to User Photo Location field when setting User Photo Location in User Settings, lead to Remote Code Execution.