Menu
Is this 100% safe against XSS? If not, can you please provide example bad string text showing me why it is not.
<html>
<body>
<script>
<?php
$bad = "some bad string. please give example text that makes the below unsafe";
echo "var a = ".json_encode($bad).";";
echo "var b = ".json_encode(array($bad)).";";
?>
</script>
</body>
</html>
Thanks.
376
In short, it's safe. Possible XSS would require escaping from the javascript string (") or script (</script>). Both strings are properly escaped:
" becomes \"
</script> becomes <\/script>
This is the the part about direct injection. Your application should take in account that some array elements may be missing. Another possibility is that an array element is not the type you would expect (e.g., an array instead of a string)
103
Definitely not!!!
Don't use json_encode to escape javascript.
for example:
json_encode<img src=# onerror=alert(1)>, this will escape nothing and output to brower. This is a xss.
use htmlspecialchars instead.
26
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
