CVE 2009-1107
The Java Plug-in in Java SE Development Kit (JDK) and Java Runtime Environment (JRE) 6 Update 12 and earlier, and 5.0 Update 17 and earlier, allows remote attackers to trick a user into trusting a signed applet via unknown vectors that misrepresent the security warning dialog, related to a "Swing JLabel HTML parsing vulnerability," aka CR 6782871.
See the 
CVE page on Mitre.org
for more details.
