The basic OAuth process is widely used to integrate third-party functionality that requires access to certain data from a user's account. This means users can fine-tune which data they want to share rather than having to hand over full control of their account to a third party. Crucially, OAuth allows the user to grant this access without exposing their login credentials to the requesting application. OAuth is a commonly used authorization framework that enables websites and web applications to request limited access to a user's account on another application. If you're already familiar with the basic concepts behind OAuth vulnerabilities and just want to practice exploiting them on some realistic, deliberately vulnerable targets, you can access all of the labs in this topic from the link below. This topic was written in collaboration with PortSwigger Research, alongside the paper Hidden OAuth Attack Vectors.
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Finally, we've included some guidance on how to protect your own applications against these kinds of attacks. We'll also explore some vulnerabilities in OAuth's OpenID Connect extension. Don't worry if you're not too familiar with OAuth authentication - we've provided plenty of background information to help you understand the key concepts you'll need. In this section, we'll teach you how to identify and exploit some of the key vulnerabilities found in OAuth 2.0 authentication mechanisms. This can result in a number of vulnerabilities, allowing attackers to obtain sensitive user data and potentially bypass authentication completely. OAuth 2.0 is highly interesting for attackers because it is both extremely common and inherently prone to implementation mistakes. The chances are that this feature is built using the popular OAuth 2.0 framework. While browsing the web, you've almost certainly come across sites that let you log in using your social media account.
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