Error tolerance is a system’s ability to stay safe when users make mistakes. In cybersecurity, this means the design does not assume perfect behavior: it uses guardrails, safe defaults, confirmation steps, access limits, and rollback options so one wrong click, typo, or misconfiguration does not become a major security or privacy failure.
Error tolerance matters because many real incidents start with ordinary human error rather than advanced exploitation. A resilient system reduces the blast radius of mistakes by limiting privileges, warning before risky actions, and making abnormal activity easier to detect. Defenders use it in privacy-by-design, data loss prevention, and admin controls; attackers often try to exploit the opposite, relying on confusing interfaces, rushed operators, or unsafe defaults to trigger unauthorized exposure. Good error tolerance does not remove responsibility-it helps security hold up when people are imperfect.