The recent Sign in with Apple vulnerability earned a researcher $100,000 as a part of Apples bug bounty program. The flaw arose from an OAuth-style implementation that did not properly validate JWT authentication between requests. Single sign-on (SSO) is a centralized approach to authentication and authorization. It improves overall security and user experience (UX) by relieving the end user from repeatedly signing up or signing into a service. Users should employ the use of a password manager and update SSO logins with strong passwords.”]
Source: https://www.csoonline.com/article/3564695/5-best-practices-to-secure-single-sign-on-systems.html