Critical
CVSS 9.8 Business Logic Responsible Disclosure
Disclosure
Unauthenticated Xbox Order Creation on Internal API (redeem-cards.com)
The internal Xbox order fulfillment API at redeem-cards.com is accessible from the public internet without any authentication. The UserType: [vendor]Bot HTTP header bypasses all authentication, granting direct access to order creation logic that reaches the DecideXboxPreOrder() function -- one step from triggering real monetary transactions on Mi
- Target
- EU Gaming Key Marketplace
- Category
- Business Logic
- 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.