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OpenAdvisories
High · 7.3 CVE-2026-44549 EUVD-2026-30639GHSA-jwf8-pv5p-vhmcPYSEC-2026-2744

Open WebUI: Stored XSS in excel file preview

Published May 15, 2026 · Updated May 18, 2026 · Assigned by GitHub_M

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, Excel file attachments are previewed in an unsafe way. A crafted XLSX file payload can be used to cause the sheetjs function sheet_to_html to embed an XSS payload into the generated HTML. This is subsequently added to the DOM unsanitized via @html causing the payload to trigger. This vulnerability is fixed in 0.8.0.

Affected products

VendorProductAffectedFixed
open-webui open-webui < 0.8.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI open-webui < 0.8.0 0.8.0 GHSA-jwf8-pv5p-vhmc

References