The FIFU plugin for WordPress can be hacked by attackers who have Contributor-level access or higher. This allows them to add harmful code to a page’s Featured Image custom fields, which will run when someone views that page. This vulnerability affects all versions up to and including 5.2.7, and was only partially fixed in version 5.2.2.
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Version compare shows which versions have a vulnerability. For example: >= 2.2.8 <= 2.2.21 means:
> from 2.2.8
= including 2.2.8 & 2.2.21
< to 2.2.21
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