---
id: CVE-2026-109290
title: >-
  Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting
  vulnerability in DocxPreview.svelte that allows authenticated users to execute
  script by uploading crafted DOCX attachments
summary: >-
  Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting
  vulnerability in DocxPreview.svelte that allows authenticated users to execute
  script by uploading crafted DOCX attachments. Attackers can embed an OOXML
  altChun…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-79
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:22.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109290'
references:
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-preview
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.190Z'
---

## Overview

Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelte that allows authenticated users to execute script by uploading crafted DOCX attachments. Attackers can embed an OOXML altChunk HTML part or script-scheme hyperlink to steal a previewing administrator's session token from local storage and take over the instance.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.