WordPress is not as insecure as its reputation would suggest. Rather it is a top target due to its incredible prevalence. Yes, there are a lot of vulnerabilities in the WordPress ecosystem, but most of them are in a small percentage of the plugins. While many plugins do not contain vulnerabilities at all because of their small size, the ones that do have issues, have a lot of them. The more lines of code a plugin has, the more vulnerabilities it has on average.
I would have thought that would be pretty obvious. Still, it’s an interesting read, if only to get a list of plugins you’d probably want to avoid.