IAPP Exam CIPT Topic 6 Question 95 Discussion

An organization has recently experienced a data breach where large amounts of personal data were compromised. As part of a post-incident review, the privacy technologist wants to analyze available data to understand what vulnerabilities may have contributed to the incident occurring. He learns that a key vulnerability had been flagged by the system but that detective controls were not operating effectively. Which type of web application security risk does this finding most likely point to?