Input validation vulnerability in Spiffy Calendar 4.9.1

The Spiffy Calendar plugin for WordPress is not secure in versions up to and including 4.9.1. Someone with access to the plugin

Detected in:

Spiffy Calendar fixed vulnerable versions: >= * <= 4.9.1

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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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