---
id: CVE-2026-70480
title: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform
summary: >-
  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 withou…
severity: medium
cvss: 4.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N'
cwe:
  - CWE-918
vendor: openwebui
product: open_webui
affected:
  - 'open_webui >= 0.6.34, < 0.11.0'
patched:
  - open_webui 0.11.0
published: '2026-08-04'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T14:45:55.337'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70480'
references:
  - url: >-
      https://github.com/open-webui/open-webui/commit/5278eb906ebecefc6538a19bc86df09d997e43e6
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/pull/26806'
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/releases/tag/v0.11.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-rffm-9q57-q649'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00346
epssPercentile: 0.25343
aliases:
  - GHSA-rffm-9q57-q649
ecosystem: pip
ingestedAt: '2026-08-04T20:41:43.916Z'
---

## Overview

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 >= 0.6.34, < 0.11.0`

## Remediation

Upgrade past the affected range:

- `open_webui 0.11.0`

## Package advisory (CVE-2026-70480)

Affected packages:

- `open-webui >= 0.6.34, < 0.11.0`

Patched in:

- `open-webui 0.11.0`

Source: https://github.com/advisories/GHSA-rffm-9q57-q649