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Cross Site Scripting(XSS) Vulnerability via upload in Latest Release 3.4.0a admin/upload.php #1323

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Aquilao opened this issue Dec 1, 2019 · 0 comments
Open

Cross Site Scripting(XSS) Vulnerability via upload in Latest Release 3.4.0a admin/upload.php #1323

Aquilao opened this issue Dec 1, 2019 · 0 comments
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SECURITY

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@Aquilao
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Aquilao commented Dec 1, 2019

Hi, I would like to report Cross Site Scripting(XSS) Vulnerability via upload in latest release(3.4.0a) admin/upload.php.

Description:
Cross-site scripting (XSS) vulnerability in admin/upload.php
url:
http://localhost/admin/upload.php

There use blacklist, I can't upload some file like php、html, but I can Upload any extensions name not on the blacklist, like a.asd、b.lol. Browsers will interpret it as html, so we can execute JavaScript code.

payload:

<html>
<img src=x onerror=alert(1)> <--xss test
</html>

GetSimpleCMS_Upload_XSS1

Upload XSS.lol and visit it.

GetSimpleCMS_Upload_XSS2
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@tablatronix @Aquilao