Description
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 products
openwebui: open webui
References5
- github.com/open-webui/open-webui/pull/26806 PatchVendor Advisory
- github.com/open-webui/open-webui/security/advisories/GHSA-rffm-… ExploitPatchVendor Advisory
- github.com/open-webui/open-webui/security/advisories/GHSA-rffm-… ExploitPatchVendor Advisory
- github.com/open-webui/open-webui/commit/5278eb906ebecefc6538a19… Patch
- github.com/open-webui/open-webui/releases/tag/v0.11.0 Release Notes
Metrics
- CVSS 3.1
-
4.1
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N - EPSS — exploit probability
- 0% percentile: 29 · as of 13 November 2026
- CWE
- CWE-918
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.