Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

CVE-2026-59214Open WebUI: Stored web worker XSS via Pyodide

High 7.3

In plain English

A high-severity cross-site scripting in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.4%top 63.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.10.0	GHSA-4r2p-27mh-5m22
PyPI	open-webui	0.10.0	PYSEC-2026-3590

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.10.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

References

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