WordPress uses an open source structure, meaning that programmers can access the page’s source code to see how it works, adapt it based on their needs, and share their code online.
On one hand, this can be viewed as a positive aspect, as it saves developers time.
On the other hand, however, this structure can also leave your website vulnerable to being compromised. Having all your systems code available online makes it that much easier for hackers to find security holes.
There is a hacker attack every 39 seconds. (Source: Security magazine).
Antihacker is a free wordpress plugin to improve system security, scan your site and help prevent unauthorized access to your account by restrict access to login page to whitelisted IP addresses.