OWASP Top 10 2021 - A09: Security Logging and Monitoring Failures
Logging and monitoring failures occur when security-relevant events are not properly captured, stored, or analyzed, making it difficult or impossible to detect ongoing attacks or respond effectively. These failures include missing logs, incomplete data, ineffective alerting mechanisms, insecure log storage, and inadequate retention policies. Such gaps are often exploited by attackers who rely on invisibility to move laterally across systems.