CVE-2026-26192

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.7.0, aanually modifying chat history allows setting the `html` property within document metadata. This causes the frontend to enter a code path that treats document contents as HTML, and render them in an iFrame when the citation is previewed. This allows stored XSS via a weaponized document payload in a chat. The payload also executes when the citation is viewed on a shared chat. Version 0.7.0 fixes the issue.

Score

CVSS 3.1 7.3 High

Status

Analyzed - security-advisories@github.com

Published

2026-02-19

Last modified

2026-02-19

Weaknesses

CWE-79

Affected products

• Open-webui (Open-webui)
• Open Webui (Openwebui)

References

• https://github.com/open-webui/open-webui/blob/6f1486ffd0cb288d0e21f41845361924e0d742b3/src/lib/components/chat/Messages…
• https://github.com/open-webui/open-webui/security/advisories/GHSA-xc8p-9rr6-97r2