High severityNVD Advisory· Published Jul 9, 2026· Updated Jul 9, 2026
Open WebUI: Stored web worker XSS via Pyodide
CVE-2026-59214
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
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | < 0.10.0 | 0.10.0 |
Affected products
1- Range: <0.10.0
Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-4r2p-27mh-5m22ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-59214ghsaADVISORY
- github.com/open-webui/open-webui/security/advisories/GHSA-4r2p-27mh-5m22ghsax_refsource_CONFIRMWEB
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