HTTP Response Splitting vulnerability in the Surveys module in PHP-Nuke 7.6 allows remote attackers to spoof web content and poison web caches via hex-encoded CRLF ("%0d%0a") sequences in the forwarder parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20116
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1183
http://www.digitalparadox.org/advisories/pnuke.txt