This article is a part of our Vulnerability Database (back to index)
Cross-site Scripting occurrences in Xiunobbs
Cross Site Scripting (XSS) in xiunobbs 4.0.4 allows remote attackers to execute arbitrary web script or HTML via the attachment upload function. (2022-09-07, CVE-2020-19914)
A cross-site scripting (XSS) vulnerability in the component /admin/?setting-base.htm of Xiuno BBS 4.0.4 allows attackers to execute arbitrary web scripts or HTML via the sitebrief parameter. (2021-10-04, CVE-2020-21496)
A cross-site scripting (XSS) vulnerability in the component /admin/?setting-base.htm of Xiuno BBS 4.0.4 allows attackers to execute arbitrary web scripts or HTML via the sitename parameter. (2021-10-04, CVE-2020-21495)
A cross-site scripting (XSS) vulnerability in the component install\install.sql of Xiuno BBS 4.0.4 allows attackers to execute arbitrary web scripts or HTML via changing the doctype value to 0. (2021-10-04, CVE-2020-21494)
The editor in Xiuno BBS 4.0.4 allows stored XSS. (2018-08-20, CVE-2018-15559)
Why Cross-site Scripting can be dangerous
Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.
The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:
https://server.com/confirmation?message=Transaction+Complete
what results in:
<span>Confirmation: Transaction Complete</span>
In that case the message can be modified to become a valid Javascript code, e.g.:
https://server.com/confirmation?message=<script>dangerous javascript code here</script>
and it will be executed locally by the user's browser with full access to the user's personal application/browser data:
<span>Confirmation: <script>dangerous javascript code here</script></span>