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The issue is related to Stored Cross-Site Scripting via the `exad infobox animating mask style` parameter due to insufficient input sanitization and output escaping. This allows authenticated attackers with contributor access or higher to inject arbitrary web scripts in pages, which will execute when a user accesses an injected page.

The issue is related to Stored Cross-Site Scripting via the plugin's Calendy widget due to insufficient input sanitization and output escaping on user-supplied attributes. This allows authenticated attackers with contributor-level access and above to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.