Critical
CVSS 9.8 Broken Authentication Responsible Disclosure
Disclosure
Password Reset OTP Brute Force Leads to Full Account Takeover
Password reset endpoint allows 84 consecutive OTP attempts per window with unlimited OTP requests. 4-6 digit OTP keyspace exhaustible within hours enabling account takeover of any user.
- Target
- African Neobank
- Category
- Broken Authentication
- 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.