CVE-2023-4021

Summary

CVE-2023-4021 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Modern Events Calendar lite plugin for WordPress. This issue stems from insufficient input sanitization and output escaping in versions up to 7.1.0. Attackers, with administrative privileges, can exploit this flaw by injecting arbitrary web scripts using Google API key and Calendar ID. These malicious scripts will execute whenever a user visits an injected page, posing a significant risk for multi-site installations and those with unfiltered_html disabled.

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