Input validation vulnerability in WP Calendar 1.5.3

The WP Calendar plugin for WordPress is not secure in versions up to and including 1.5.3. This means that people with access to the plugin can add malicious code to pages. When someone visits a page with this code

Detected in:

WP Calendar open vulnerable versions: >= * <= 1.5.3

This information is sourced from www.wpvulnerability.com. An open-source database of vulnerabilities maintained by the community. Help us out by submitting vulnerabilities!

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

Is this information incorrect? Please leave us a message.