Conduent Business Services’ 2024 data breach now impacts over 62.2 million individuals, a figure that more than doubles the initial victim count previously estimated at "25 million plus"1. This significant revision positions the incident as potentially the third-largest health data breach ever formally reported to regulatory bodies. Conduent, a prominent back-office services firm crucial for various administrative operations, initially disclosed the compromise in 2024. The substantial increase in affected individuals underscores the evolving nature of large-scale cybersecurity incidents and the often-protracted process of accurate victim identification, which for this event has extended over two years. For organizations relying on third-party service providers for critical data processing, particularly within sensitive sectors like healthcare, this escalation highlights persistent challenges in vendor risk management and the potential for initial breach assessments to be vastly underestimated. It serves as a stark reminder for cybersecurity practitioners to maintain robust due diligence on supply chain security and to prepare for long-tail incident response scenarios and significant scope creep.