<a href="' . qa_path_html('ip/' . $ip) . '" title="' . qa_lang_html_sub('main/ip_address_x', qa_html($ip)) . '" class="qa-ip-link">' . $anchorhtml . '</a>
It's not a security issue, because the input apparently is being sanitzed. If it weren't that would be a code injection vulnerabilty.
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April 20, 2021: Q2A 1.8.6 released!