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
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MLIST:[oss-security] 20101102 Re: utf-8 security issue in php
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