Headline
CVE-2023-48302: Self XSS when pasting HTML into Text app with Ctrl+Shift+V
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and Nextcloud Enterprise Server, when a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.13, 26.0.8, and 27.1.3 contain a fix for this issue. As a workaround, disable app text.
Package
Server (Nextcloud)
Affected versions
>= 25.0.0, >= 26.0.0, >= 27.0.0
Patched versions
25.0.13, 26.0.8, 27.1.3
Server (Nextcloud Enterprise)
>= 25.0.0, >= 26.0.0, >= 27.0.0
Description
Impact
When a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render.
Patches
It is recommended that the Nextcloud Server is upgraded to 25.0.13, 26.0.8 or 27.1.3
It is recommended that the Nextcloud Enterprise Server is upgraded to 25.0.13, 26.0.8 or 27.1.3
Workarounds
- Disable app text
References
- HackerOne
- PullRequest
For more information
If you have any questions or comments about this advisory:
- Create a post in nextcloud/security-advisories
- Customers: Open a support ticket at portal.nextcloud.com