MajorCritical vulnerability
CVE-2026-109290 (CVSS 8.4)
NVD · officialPublished Oct 12, 2026Risk 37/100
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.
Technical details
CVSS
8.4
AV:NetworkAC:LowPR:LowUI:Active
Evidence and sources
This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
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