What’s Vulnerable › Vulnerabilities
CVE-2026-59214: Open WebUI: Stored web worker XSS via Pyodide
- Severity: critical (CVSS 9.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-09 · updated 2026-07-10
- Weakness: CWE-79
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 products
- open-webui: before 0.10.0 — fixed in 0.10.0
How to fix
Upgrade to a fixed version: open-webui 0.10.0. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-59214 or the next vulnerability affects your stack