Critical
CVSS 10.0 Business Logic Responsible Disclosure
Disclosure
Unlimited Live Payout Creation Without Verification on Payment Gateway
Live payout creation endpoint accepts unauthenticated requests producing unlimited real-money payouts to attacker-controlled accounts.
- Target
- European Payment Gateway
- Category
- Business Logic
- 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.