High severity7.3NVD Advisory· Published Oct 12, 2026

CVE-2026-109290

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.

Affected products

Openwebui/Open Webuillm-fuzzy
Range: <0.11.4

Patches

Vulnerability mechanics

References

github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cgnvd
www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-previewnvd

News mentions

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cvss	0.474
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000