High
CVSS 9.1 Credential Exposure Responsible Disclosure
Disclosure
TOTP 2FA Secret Exposed in Plaintext via Profile API
Authenticated user can retrieve their TOTP secret seed in plaintext, allowing attackers with session hijack to clone 2FA indefinitely.
- Target
- European Payment Gateway
- Category
- Credential Exposure
- 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.