All Case Studies
CRITICAL2024

Authentication Bypass in Global Fintech Platform

Web Application Penetration Test

The Scenario

A Series C fintech platform processing $2B+ in annual transactions engaged RedOps for a black-box web application penetration test ahead of a major product launch. The client believed their OAuth2 implementation was secure following an internal review.

The Impact

Within 48 hours of testing, our team identified a chain of vulnerabilities that allowed complete authentication bypass, full account takeover, and unauthorized access to all transaction records.

The Outcome

The client delayed their launch, remediated all critical findings in 12 days, and retested successfully before going live.

Exposure Avoided

$4M+ in GDPR fines.

Key Findings

Critical
JWT algorithm confusion (RS256→HS256) allowing forged tokens for any user account including administrator
Critical
IDOR in transaction API - sequential IDs exposed all user transactions without authentication after JWT bypass
High
OAuth2 state parameter not validated, enabling CSRF against OAuth flow for account linkage hijacking
High
Webhook endpoint vulnerable to SSRF allowing internal network enumeration and metadata service access
Medium
Rate limiting absent on OTP endpoint enabling brute-force of 6-digit verification codes in under 3 minutes
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