CVE-2026-109290

HIGHCVSS 7.3

Description

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.

Timeline

Published:October 12th, 2026 5:17 PM

Last modified:October 15th, 2026 3:55 PM

CVSS Scoring

CVSS v3: 7.3 (HIGH)

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

Weaknesses (CWE)

CWE-79

References & Reports

Advisories, patches, and third-party reports

https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg
https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-preview
https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg

Source: NIST NVD · Data may lag official sources by up to one minute