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Cross-site Scripting occurrences in Csz Cms
A cross site scripting (XSS) vulnerability in CSZ CMS 1.2.9 allows attackers to execute arbitrary web scripts or HTML via a crafted payload entered into the 'New Article' field under the 'Article' plugin. (2021-07-09, CVE-2020-25392)
A cross site scripting vulnerability in CSZ CMS 1.2.9 allows attackers to execute arbitrary web scripts or HTML via a crafted payload entered into the 'New Pages' field under the 'Pages Content' module. (2021-07-09, CVE-2020-25391)
CSZ CMS 1.2.9 is affected by a cross-site scripting (XSS) vulnerability in multiple pages through the field name. (2021-03-11, CVE-2021-26776)
A stored cross-site scripting (XSS) vulnerability in cszcms 1.2.9 exists in /admin/pages/new via the content parameter. (2021-03-10, CVE-2021-3224)
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>