Paper/Archive/CVE-2026-59214

CVE-2026-59214

open-webui open-webui — Open WebUI: Stored web worker XSS via Pyodide

CVSS 9.0 (NVD)9.0 / 10 × 3027.0 Not in CISA KEV+300.0 EPSS percentile 36.7.367 × 207.3 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

open-webui< 0.10.0–CNA

Scores by source

NVD9.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

GitHub_M (CNA)7.3CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/open-webui/open-webui/security/advisories/GHSA-4r2p-27mh-5m22