Input validation vulnerability in Chat Button by GetButton.io 1.8.4

The Chat Button plugin for WordPress is not secure against certain kinds of attacks for versions up to and including 1.8.4. This means that someone with access to administrator-level or higher on a WordPress multi-site installation or installation with disabled unfiltered_html could inject malicious web scripts into pages. These scripts will then execute every time a user visits the page.

Detected in:

Chat Button by GetButton.io fixed vulnerable versions: >= * <= 1.8.9.4

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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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