Critical
CVSS 9.1 CORS HackerOne
Disclosure
CORS Wildcard on Financial/Checkout Endpoints Enables Cross-Origin Purchase and Balance Theft
Beyond the user profile endpoints (Finding 13), the SLS API also exposes financial and checkout endpoints with CORS wildcard (), including checkout/buyNow/buy, store-credit/get-balance, userBar/getCustomerScWor (store credit/wallet), and site/getAIChatSessionToken. Combined with the localStorage token storage (Finding 17), an attacker with a sto
- Target
- SEA Gaming Marketplace
- Category
- CORS
- Channel
- HackerOne
- 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 HackerOne 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.