Yesterday, three exploits related to social logins and token verification were discovered and reported by a security firm. The affected applications include Vidio, Bukalapak, and Grammarly, all of which have millions of active users. Surprisingly, even these well-established companies had insecure implementations of “Login With Facebook,” putting user accounts at risk of takeover. While the details of the exploits are not discussed in this post, the article emphasizes the importance of validating token signatures and claims when using OAuth tokens. The breaches highlight the need for robust customer identity and access management (CIAM) tools to protect user data. Implementing CIAM correctly can be complex, but using a secure system like FusionAuth offers peace of mind.
https://fusionauth.io/blog/grammarly-proves-ciam-not-optional