Several factors can make your WordPress site more vulnerable to WordPress security issues. Checkout a detailed Article on Common WordPress Security Issues
REASON #1. Weak Passwords
Using a weak password is one of the biggest security threats you can easily avoid. Your WordPress admin password should be strong, that must include multiple types of characters, symbols or numbers. In addition, your password should be specific to your WordPress site and not used anywhere else or any other type of account.
REASON #2. Not Updating WordPress, Plugins or Themes
Running outdated versions of WordPress, plugins, and themes can be an open invitation for attacks. Version updates often include patches for security issues in the previously installed version, so it’s important to always run the latest version of all software installed on your WordPress website.
Updates will appear in your WordPress dashboard as soon as they’re available. Make sure to create a backup and then running all available updates every time you log in to your WordPress site. While the task of running updates may seem inconvenient sometimes but, it’s an important WordPress security best practice.
If you manage more than one WordPress website, then there are plugins available on WordPress repository to sync all site at one place and can help by giving you one dashboard to manage multiple WordPress sites.
REASON #3. Using Plugins and Themes from Untrustworthy Sources
Poorly-written, insecure, nulled or outdated code is one of the most common ways attackers can get access to your WordPress website. Since plugins and themes are potential sources of security threats, as a security best practice, only download and install WordPress plugins and themes from reputable sources, such as from the WordPress.org repository, or from premium companies that have been in business for a while. Also, avoid NULLED or “FREE” versions of premium themes and plugins, as the files may have been altered to contain malware.
REASON #4. Using Poor-Quality or Shared Hosting
Since the server where your WordPress website hosts is a target for attackers, using cheap hosting or shared hosting can make your site more vulnerable to being hacked. While all hosts take precautions to secure their servers, but not all hosting providers uses the latest security measures to protect websites on the server-level.
Shared hosting can also be a concern because multiple websites are stored on a single server. If one website is hacked, attackers may also gain access to other websites and their data. While using a VPS, or virtual private server, is more expensive, it assures your website is stored on its own server.