High
CVSS 8.8 JWT Issues Responsible Disclosure
Disclosure
Deep Scan Findings
The endpoint accepts a JSON body with `email` and `phone` fields, and returns a signed JWT token containing those exact values. No validation is performed: - Any email/phone combination accepted - Token expiry is approximately 24 hours 3. Generate token for arbitrary user:
- Target
- MENA Crypto Exchange
- Category
- JWT Issues
- Channel
- Responsible Disclosure
- Disclosed
- 2026-04
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.