EUVD-2026-42616
GHSA-4r2p-27mh-5m22
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Low-priv attacker stores payload (PR:L) but a privileged victim must click Run (UI:R); browser-context code reaches server admin APIs, so scope changes (S:C) with full C/I/A impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorNVD
Lifecycle Timeline
10DescriptionNVD
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.
Articles & Coverage 1
AnalysisAI
Privilege escalation and server-side code execution in Open WebUI before 0.10.0 lets a low-privileged authenticated user plant a malicious chat payload that, when a victim (typically an admin) clicks Run, executes client-side Python via Pyodide in a same-origin web worker and issues authenticated same-origin requests to admin-only endpoints. Because the requests inherit the victim's session, the attacker can reach administrative APIs and trigger server-side code execution through configured tools. No public exploit has been identified at time of analysis, and EPSS is low (0.25%), but CVSS is 9.0 with total technical impact per CISA SSVC.
Technical ContextAI
Open WebUI is a self-hosted AI chat platform that embeds Pyodide - a WebAssembly build of CPython - to run user-supplied Python directly in the browser. The flaw stems from running that interpreter inside a same-origin web worker with no network egress isolation: pyodide.http.pyfetch and the browser's js-module fetch/XMLHttpRequest APIs can be reached from stored chat content and inherit the origin's cookies/session. Classified as CWE-79 (stored cross-site scripting), the root cause is that untrusted, persisted chat payloads are treated as executable content in a privileged same-origin context; when executed they act as a confused deputy, bridging the browser session into the server's admin API surface and the tool-execution backend.
RemediationAI
Upgrade to Open WebUI 0.10.0 or later, which contains the fix (Vendor-released patch: 0.10.0); see the advisory at https://github.com/open-webui/open-webui/security/advisories/GHSA-4r2p-27mh-5m22. Until you can upgrade, reduce exposure by disabling or restricting the in-browser Pyodide/Python code-execution feature so chat payloads cannot invoke pyfetch/fetch/XMLHttpRequest, and avoid running (clicking Run on) code from shared or untrusted chats - with the trade-off that legitimate client-side Python and tool workflows will be unavailable. Additionally, tighten account provisioning to limit who can create accounts and store chat content, and restrict which server-side tools are configured and callable, since the impact hinges on reaching admin-only endpoints and configured tools; note these controls narrow but do not fully eliminate the same-origin confused-deputy path.
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External POC / Exploit Code
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