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.
d1aeec67eec6887d76ca8f55deb110bf96caf2a2d7dc196f59f2420f47db0f9a