CVE-2026-109290

Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview

State: Published
Severity: 8.4 High
Published: Oct 12, 2026
Updated: Oct 23, 2026
Reserved: Oct 12, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.4 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	8.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-1021 Improper Restriction of Rendered UI Layers or Frames

Affected Products

Product	Versions
open-webuiopen-webui	0.11.1 to before 0.11.4Affected 0.11.4Not affected

References

GitHub Security Advisory (GHSA-f9xp-mfmq-x6cg)vendor-advisory
VulnCheck Advisory: Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Previewthird-party-advisory

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