We examine factors associated with employees' susceptibility to phishing attacks in a professional services firm and a financial services firm (bank). We measure three dimensions of suspicion (skepticism, suspicion of hostility, and interpersonal trust), and three cognitive traits (risk-taking propensity, cognitive [inhibitory] control, and social cognition), while controlling for demographic and work context factors. We find that these traits interact in complex ways in determining individuals' susceptibility to phishing attacks. Bank employees are more susceptible to being phished than professional services firm employees, but within the bank, the employees with professional certificates are less susceptible to phishing attacks than other bank employees. Also, employees with self-reported responsibility for cybersecurity are less likely to be phished. These findings could be used to create a screening tool for identifying which employees are particularly susceptible to phishing attacks, to tailor training, or redesign jobs to counter those susceptibilities and reduce security risk.

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