| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/gotify/server | < 2.2.2all versions | 2.2.2 |
| github.com/gotify/server/v2 | < 2.2.2 | 2.2.2 |
| server | < 2.2.2 | 2.2.2 |
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.
The vulnerability has been fixed in version 2.2.2.
You can block access to non image files via a reverse proxy in the ./image directory.
https://github.com/gotify/server/pull/534 https://github.com/gotify/server/pull/535
Thanks to rickshang (aka 无在无不在) for discovering and reporting this bug.
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