CVE-2026-44549: Openwebui Open Webui

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

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

• Openwebui Open Webui: before 0.8.0 (fixed in 0.8.0)

Published 2026-05-15. Last modified 2026-06-17.