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An application has the following javascript code which is triggered whenever an user tries to upload a file.

a.html(fileName)

then if the user uploads a file named <img src=x onerror=alert()> the javascript code is executed.

Does this qualify as a Low-severity DOM-XSS? I mean, usually I see DOM-XSS which exploit URL giving more strength to the attack. In this case I should trick a user to upload a file with a specific name, so it's like a self-xss. Also, I couldn't find a cve for this kind of DOM-XSS.

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  • it's much easier to use devtools to run code client-side. I don't see how this could inadvertently jeopardize a real user in the real world. FWIF, you should use a.text(fileName) to avoid such XSS.
    – dandavis
    Commented Jul 19, 2021 at 20:08

1 Answer 1

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In my opinion, yes, this is a low to very low severity example of XSS. User-controlled input is rendered insecurely.

The fact that this requires a user to upload a specially crafted file, reduces the likelihood of abuse, not the impact.

People are the weakest link in cybersecurity. They can be tricked into uploading any file.

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