I hate Ultimate membership, and all plugins except maybe this one: https://wpusermanager.com/ but this one - expensive. With Ultimate Membership Plugin I have long story, long and awful story full of bugs, of resource draining, and refusing to fix bugs with indexes that provoke infinite sql loops. Source: almost 2 years ago

During insurance renewals with cyber cover but you could always provide the underwriters with a report from something as simple as https://wpsec.com/ which should reduce it. My concern with your model is that that you must keep in mind the state of the insurance market and always attempt to reduce your clients' overall cost for selecting your service. If your service is going to quote higher than insurance without... Source: over 1 year ago

I would suggest contacting GoDadd for help, but from what you've described sounds like WordPress itself maybe the issue. Could be installation issue like an insecure SQL connection or a vulnerability in a plugin / theme. Sounds like you've taken a good first action in cycling out passwords and logins, another step to take would be scan the site with a vulnerability scanner like https://wpsec.com/ and look into a... Source: over 2 years ago

Try running a scan on https://wpsec.com/ to see where you are on security. The report may give you some ammo when you talk to the boss. Source: over 2 years ago