Critical
CVSS 9.6 CORS HackerOne
Disclosure
CORS Wildcard + localStorage Bearer Token = Full Cross-Origin Account Takeover Chain
The [vendor] Vue.js SPA stores the user's authentication Bearer token in localStorage under the key accessToken. Combined with the CORS wildcard () on sls.[vendor] that allows Authorization header in cross-origin requests, and the DELETE method enabled on /user/account, this creates a full account takeover and destruction chain exploitable
- 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.