Vulnerability GHSA-xv6x-456v-24xh
Summary
gotify/server vulnerable to Cross-site Scripting in the application image file upload
Details
Impact
The XSS vulnerability allows authenticated users to upload .html files. With that, an attacker could execute client side scripts if another user opened a link, such as:
https://push.example.org/image/[alphanumeric string].html
An attacker could potentially take over the account of the user that clicked the link. Keep in mind, the Gotify UI won't natively expose such a malicious link, so an attacker has to get the user to open the malicious link in a context outside of Gotify.
Patches
The vulnerability has been fixed in version 2.2.2.
Workarounds
You can block access to non image files via a reverse proxy in the ./image directory.
References
https://github.com/gotify/server/pull/534 https://github.com/gotify/server/pull/535
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