When it comes to testing authentication, you’ll find that many of the flaws that have plagued web applications for decades have been ported over to APIs: bad passwords and password requirements, default credentials, verbose error messaging, and bad password reset processes.
In addition, several weaknesses are much more commonly found in APIs than traditional web apps. Broken API authentication comes in many forms. You might encounter a lack of authentication altogether, a lack of rate limiting applied to authentication attempts, the use of a single token or key for all requests, tokens created with insufficient ...
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