Input validation vulnerability in Custom Banners 2.1

A security issue has been discovered in a plugin called Custom Banners

Detected in:

Custom Banners open vulnerable versions: >= * < 2.1

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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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