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.
Exploitability
AV:NAC:LPR:LUI:RScope
S:UImpact
C:HI:HA:N7.3/CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:NInjection