CVE-2026-44549 HIGH

CVE-2026-44549: Open WebUI: Stored XSS in excel file preview

Vendor Open-Webui
Product open-webui
Weakness CWE-79 · XSS
Published May 15, 2026
Last update May 18, 2026
View on NVD All CVEs

CVSS base score

7.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 15, 2026 CVE published
May 18, 2026 Record updated