CVE-2026-109290GHSA-f9xp-mfmq-x6cg
open-webui: Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview
open-webui open-webui
CVSS
8.4HighExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 13 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 0.11.4open-webuiCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 2
- open-webuiaffected: 0.11.1 before 0.11.4CVE List
- open-webuiunaffected: 0.11.4CVE List