Cross-site scripting (XSS) vulnerability in captchademo.php in Unijimpe Captcha allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO.
https://exchange.xforce.ibmcloud.com/vulnerabilities/75708
http://packetstormsecurity.org/files/112785/Unijimpe-Captcha-Cross-Site-Scripting.html