CVE-2026-59214

Open WebUI: Stored web worker XSS via Pyodide

State: Published
Severity: 7.3 High
Published: Jul 9, 2026
Updated: Jul 9, 2026
Reserved: Jul 2, 2026

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue authenticated same-origin requests when a victim clicks Run, which can reach admin-only endpoints and execute server-side code through configured tools. This issue is fixed in version 0.10.0.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
open-webuiopen-webui	< 0.10.0Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-4r2p-27mh-5m22

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