How I dumped users’ passports from the exchange
hackenproof.com | blog | #bug-bounty | #vulnerability-research | #data-exposure | #brute-force | #writeup | #crypto-exchange | #kyc
Summary
A critical KYC flaw on a crypto exchange: predictable Unix-timestamp filenames and public storage let a researcher brute-force file URLs and dump users' passports.
- Published
- Collected
--- id: 5294 title: "How I dumped users’ passports from the exchange" source_domain: hackenproof.com source_url: "https://hackenproof.com/blog/critical-severity-kyc-verification-vulnerability" published_at: "2026-06-11 10:25" tags: ["bug-bounty", "vulnerability-research", "data-exposure", "brute-force", "writeup", "crypto-exchange", "kyc"] phying_url: "https://phying.com/item/5294" lang: en --- # How I dumped users’ passports from the exchange ## Summary A critical KYC flaw on a crypto exchange: predictable Unix-timestamp filenames and public storage let a researcher brute-force file URLs and dump users' passports. ## Intelligence Metadata - **Sources:** hackenproof.com - **Published:** 2026-06-11 10:25 - **Original:** https://hackenproof.com/blog/critical-severity-kyc-verification-vulnerability - **Phying News:** https://phying.com/item/5294