Open WebUI — Xss (CVE-2026-26192)
Date: 2026-02
Affected: openwebui/open_webui
Attack vector: xss
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-26192
CWE: CWE-79
CVSS: 7.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):