CVE-2026-44549
Open WebUI: Stored XSS in excel file preview
HIGH 8.7EPSS 0.4%
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
- open-webui
- CVSS v3.1 NVD
- 8.7 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N - CVSS v3.1 GITHUB
- 7.3 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N - EPSS
- 0.37% chance of exploitation in the next 30 days, 30th percentile
- Published
- 2026-05-15
- Updated
- 2026-05-18