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Identify and exploit Algorithm Confusion vulnerabilities in JSON Web Tokens (JWT). This skill details how to bypass signature verification by changing the signing algorithm from asymmetric (RS256) to symmetric (HS256) and using the public key as the symmetric secret.
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Business logic flaws are application vulnerabilities where valid functions are abused in unintended ways: price manipulation via hidden field tampering, workflow step-skipping, function call limit bypass (coupon reuse), process timing exploitation (race conditions on balance updates), and request forging via guessable/predictable parameters. Detect using Burp Suite proxy interception, HTTP POST/GET parameter analysis, and misuse-case testing against multi-step workflows. Tools: Burp Suite, OWASP ZAP.
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