CVE-2026-70480

Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.34 until 0.11.0, Open WebUI renders vega and vega-lite fenced code blocks in chat content by building a Vega view in the viewer browser without a restricted resource loader. Any user who can place such a block where another user will see it can make that user browser issue attacker-chosen outbound GET requests and read responses from same-origin or CORS-permissive targets into the rendered page. This issue is fixed in 0.11.0.

Affected

open-webui

CVSS v3.1 GITHUB

4.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N

EPSS

0.35% chance of exploitation in the next 30 days, 27th percentile

Published

2026-08-04

Updated

2026-08-05

Proof-of-concept exploits (1)

• advisories/GHSA-rffm-9q57-q649

Security advisories

• open-webui/open-webui/pull/26806
• open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649

References

• CVE Record
• NVD entry