imagesecurityxss

XSS attack with javascript in img src attribute

Some older browsers are vulnerable to XSS attacks as such

<img src="javascript:alert('yo')" />

Current versions of IE, FF, Chrome are not.

I am curious if any browsers are vulnerable to a similar attack:

<img src="somefile.js" />

or

<iframe src="somefile.js" />

or other similar where somefile.js contains some malicious script.

Solution

  • No. Image data is never executed as JavaScript. The if the src is a JavaScript link, the JavaScript is executed, but the fundamental reading of data that comes from a request to the src does not involve JavaScript.