Cross-site scripting (XSS) is the most rewarding security vulnerability, according to data on the number of bug bounties paid. According to HackerOne’s top 10 most impactful security vulnerabilities, which have earned hackers over $54m in bounties and based on over 1400 HackerOne customer programs and 120,000 reported vulnerabilities, XSS is the most paid out vulnerability, followed by “improper authentication – generic” and “information disclosure.” HackerOne’s Top 10 security vulnerabilities are:

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