Stored Cross-Site Scripting Vulnerability in Modern Events Calendar Lite for WordPress

CVE-2023-4021

What is CVE-2023-4021?

The Modern Events Calendar Lite plugin for WordPress allows for Stored Cross-Site Scripting due to inadequate input sanitization and output escaping. Authenticated attackers with administrator-level permissions can exploit this vulnerability by injecting malicious web scripts via the Google API key and Calendar ID. This risk is particularly pronounced in multi-site installations and setups where the unfiltered_html option is disabled, leading to potential execution of harmful scripts when users access compromised pages.

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