Mandriva Linux Security Advisory 2010-009 – The htmlspecialchars function in PHP before 5.2.12 does not properly handle (1) overlong UTF-8 sequences, (2) invalid Shift_JIS sequences, and (3) invalid EUC-JP sequences, which allows remote attackers to conduct cross-site scripting (XSS) attacks by placing a crafted byte sequence before a special character. The updated packages have been patched to correct this issue.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/85206/MDVSA-2010-009.txt
Source: https://packetstormsecurity.com/files/85206/Mandriva-Linux-Security-Advisory-2010-009.html