CVE-2026-44549

Open WebUI: Stored XSS in excel file preview

State: Published
Severity: 7.3 High
Published: May 15, 2026
Updated: May 18, 2026
Reserved: May 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
open-webuiopen-webui	< 0.8.0Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc

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