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Bug bounty hunters thrive on reconnaissance, and the Wayback Machine’s CDX API is one of the most powerful tools for historical data gathering. It allows researchers to retrieve archived URLs, old JavaScript files, forgotten API endpoints, and even subdomains — all without touching the target server. This makes it an invaluable resource for finding exposed credentials, outdated endpoints, and vulnerable functionalities that companies may have forgotten.
In this guide, we’ll cover advanced CDX API usage, automation tools, filtering techniques, and real-world applications to supercharge your bug bounty recon. 🚀
The Capture Index (CDX) API is a feature of the Wayback Machine that provides structured access to archived records of websites. It helps bug bounty hunters retrieve past snapshots of web pages, which can reveal:
Old API endpoints that may still be activeJavaScript files containing exposed secretsDeprecated admin panels & authentication mechanismsSubdomains that no longer exist in DNS but are still functionalInput fields vulnerable to XSS, SQLi, or SSRF attackshttps://web.archive.org/cdx/search/cdxcurl "https://web.archive.org/cdx/search/cdx?url=*.example.com/*&output=text&fl=original&collapse=urlkey"📌 What it does: Fetches all unique URLs that have ever been archived for example.com.
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