ViewVC 1.0.2 and earlier does not specify a charset in its HTTP headers or HTML documents, which allows remote attackers to conduct cross-site scripting (XSS) attacks that inject arbitrary UTF-7 encoded JavaScript code via a view.
https://exchange.xforce.ibmcloud.com/vulnerabilities/29576
http://www.securityfocus.com/bid/20543
http://www.securityfocus.com/archive/1/448762/100/0/threaded
http://www.hardened-php.net/advisory_102006.134.html
http://viewvc.tigris.org/source/browse/viewvc/trunk/CHANGES?rev=HEAD
http://viewvc.tigris.org/servlets/ReadMsg?list=announce&msgNo=5&raw=true