National sports league moves to continuous penetration testing

The project

A large professional sports league’s digital ecosystem had expanded rapidly: ticketing systems, streaming platforms, fan engagement apps, partner integrations, and internal league operations. Each system introduced new risk, and traditional annual penetration tests couldn’t keep pace with frequent releases and evolving threat activity. The league needed a testing partner that could operate at enterprise scale while adapting to constant change, and it brought in Winmill to deliver a testing model that extended beyond a single assessment window.

The challenges

• Point-in-time testing wasn’t reducing risk. Previous efforts focused on isolated applications and one-time reviews. The findings were useful, but the security team had little confidence that risk was actually going down over time.
• Shared identity flows. Complex authentication and identity flows span multiple platforms, so a weakness in one place can travel.
• Seasonal pressure. Deployment cycles are tied to seasonal events, which means rapid change right when the stakes are highest.
• Third parties and reputation. Partner integrations vary in security maturity, and fan data carries high reputational risk.

The solution

Winmill implemented structured penetration testing aligned with the league’s development and operational cadence, reflecting how attackers actually move across interconnected systems. Testing emphasized manual exploitation of application and API vulnerabilities, business logic flaws affecting ticketing and access control, authentication and session management risks, and validation of remediation within the same testing cycle. The league could see not just where vulnerabilities existed, but how quickly and effectively they were resolved.

The results

• Findings scanners missed. Within the first testing cycles, Winmill uncovered several high-risk issues that automated tools had not caught.
• A repeatable process. The security team gained a dependable way to prioritize fixes and validate progress before major events.
• Momentum. The league reported faster remediation turnaround, reduced recurrence of previously identified issues, improved collaboration between security and engineering, and greater confidence entering high-visibility seasons.

Engagements like this one are why Winmill now offers the Penetration Testing Stream, a subscription service for ongoing penetration testing, remediation guidance, and continuous assurance without the friction of repeated one-off engagements.