Choket

**Name of the Vulnerable Software and Affected Versions** Open WebUI versions prior to 0.6.6 **Description** Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Low-privileged users can upload HTML files containing JavaScript code via the "/api/v1/files/" backend endpoint, which returns a file id. This file id can be used to open the file in the browser and trigger the JavaScript code in the user's browser. Under default settings, files uploaded by low-privileged users can only be viewed by admins or themselves, limiting the impact. However, a link to such a file can be sent to an admin, and if clicked, will give the low-privileged user complete control over the admin's account, enabling remote code execution (RCE) via functions. **Recommendations** For versions prior to 0.6.6, update to version 0.6.6 or later to resolve the issue. As a temporary workaround, consider restricting access to the "/api/v1/files/" endpoint to prevent low-privileged users from uploading malicious files. Additionally, admins should exercise caution when clicking on links to files uploaded by low-privileged users.

**Name of the Vulnerable Software and Affected Versions** Open WebUI versions prior to 0.6.6 **Description** Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. A vulnerability in the way certain html tags in chat messages are rendered allows attackers to inject JavaScript code into a chat transcript. The JavaScript code will be executed in the user's browser every time that chat transcript is opened, allowing attackers to retrieve the user's access token and gain full control over their account. Chat transcripts can be shared with other users in the same server, or with the whole open-webui community if "Enable Community Sharing" is enabled in the admin panel. If this exploit is used against an admin user, it is possible to achieve Remote Code Execution on the server where the open-webui backend is hosted. This can be done by creating a new function which contains malicious python code. This vulnerability also affects chat transcripts uploaded to `https://openwebui.com/c/<user>/<chat id>`, allowing for wormable stored XSS in https://openwebui.com. **Recommendations** For versions prior to 0.6.6, update to version 0.6.6 to resolve the issue. As a temporary workaround, consider disabling the "Enable Community Sharing" feature in the admin panel to minimize the risk of exploitation. Restrict access to chat transcripts and avoid sharing them with other users until the issue is resolved. Avoid using the `https://openwebui.com/c/<user>/<chat id>` endpoint until the issue is fixed.