Why WordPress themes and plugins hacked

Many developers and website owners reported some of the WordPress themes were hacking, if that have secured password. Also many of the pluggins were hacked recently.
Why this occur ? WordPress haven't any control over its themes ?
Answer is "No". WordPress is an open software with unlimited developer access and unlimited possibilities. That's why it's too familiar in modern world for easy web creation.
So many free themes may hack in future and stole your data's without any permission. Some times a working website may get blocked or removed.
How we can safeguard wordpress hacking ?
There are some common mechanism to safeguard such vulnerable access and safeguard your websites
1, Use wordpress common themes (which is secured)
2, Never install unknown themes from free WordPress sources of third party portals
3, Many themes allowing third party plugins (which later facilitate hacking with out any login access)
4, updated themes periodically

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