CVE-2010-3870
The utf8_decode function in PHP before 5.3.4 does not properly handle non-shortest form UTF-8 encoding and ill-formed subsequences in UTF-8 data, which makes it easier for remote attackers to bypass cross-site scripting (XSS) and SQL injection protection mechanisms via a crafted string.
Date published : 2010-11-12
http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html