source: https://www.securityfocus.com/bid/52424/info

TP-LINK TL-WR740N is prone to an HTML-injection vulnerability because it fails to sufficiently sanitize user-supplied data.

Attacker-supplied HTML or script code could run in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials and control how the site is rendered to the user; other attacks are also possible.

TP-LINK TL-WR740N 111130 is vulnerable; other versions may also be affected. 

1. Go to http://www.example.com/maintenance/tools_test.htm
2. make ping like &lt;/textarea&gt;<script>prompt(2)</script>