High
CVSS 7.8 Information Disclosure Responsible Disclosure
Disclosure
HIGH - Sub-Merchant PII Disclosure via listSubMerchantPF (VKN/TCKN/Address)
Finding 52: HIGH - Sub-Merchant PII Disclosure via listSubMerchantPF (VKN/TCKN/Address) Severity: High (CVSS 7.5 - AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) Summary: `/ccpayment/api/listSubMerchantPF` endpoint'i, TUM alt-uye isyeri PF kayitlarini VKN (Vergi Kimlik Numarasi), TCKN (TC
- Target
- Turkish Payment Gateway
- Category
- Information Disclosure
- Channel
- Responsible Disclosure
- Disclosed
- 2026-03
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.