Critical
CVSS 9.6 Broken Authentication Responsible Disclosure
Disclosure
Apple OAuth CSRF via Static 'apple' State Parameter
Apple OAuth always sets state=apple allowing reliable CSRF account linkage on victim sessions.
- Target
- Global P2P Crypto Marketplace
- Category
- Broken Authentication
- 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.