Critical
CVSS 9.1 IDOR Responsible Disclosure
Disclosure
IDOR - Unauthenticated Bank Account Data Access via X-User-ID Header
Any unauthenticated attacker can read ANY user's bank account information (full legal name, bank name, masked account number, internal IDs) by simply changing the X-User-ID header. No authentication token, session cookie, or API key is required
- Target
- SEA Crypto Exchange
- Category
- IDOR
- Channel
- Responsible Disclosure
- Disclosed
- 2026-04
Redaction note
Vendor identity withheld.
This finding is documented here as part of MemCyber’s public disclosure record. The vendor has been anonymized to a sector and region descriptor. Full technical detail — including root cause, reproducible proof-of-concept, remediation guidance, and vendor attribution where granted — is available to qualified prospects under NDA.
Coordinated disclosure
How we handled it.
- Reported to the vendor via Responsible Disclosure with a reproducible proof-of-concept.
- Triage + remediation window coordinated with the vendor security team.
- Fix verified before any public reference.
- This record published only after the embargo period closed.