| Component | Open WebUI |
| Severity | high (CVSS 7.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
| Published (NVD) | 2026-02-19 |
| Last modified | 2026-06-17 |
| Affected versions | open_webui < 0.6.44 |
| Fixed in | 0.6.44 |
| Weakness | CWE-79 |
| CISA KEV | not listed |
NVD description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.6.44, aanually modifying chat history allows setting the `embeds` property on a response message, the content of which is loaded into an iFrame with a sandbox that has `allow-scripts` and `allow-same-origin` set, ignoring the "iframe Sandbox Allow Same Origin" configuration. This enables stored XSS on the affected chat. This also triggers when the chat is in the shared format. The result is a shareable link containing the payload that can be distributed to any other users on the instance. Version 0.6.44 fixes the issue.
What to do
- Upgrade Open WebUI to
0.6.44or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-26193
- https://github.com/open-webui/open-webui/security/advisories/GHSA-vjm7-m4xh-7wrc
- https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages/ResponseMessage.svelte#L689-L703
Read more
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