CVE-2026-45318

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, his advisory tracks a regression of the original Excel-preview XSS (CVE-2026-44549). The same root cause — XLSX.utils.sheet_to_html() output rendered via {@html excelHtml} without DOMPurify — was reintroduced sometime after v0.8.0 and is exploitable again This vulnerability is fixed in 0.9.3.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-15 | Updated 2026-05-18 | Assigner GitHub_M

Problem types

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

Product status

References

github.com/...-webui/security/advisories/GHSA-hcwp-82g6-8wxc exploit

github.com/...-webui/security/advisories/GHSA-hcwp-82g6-8wxc

cve.org (CVE-2026-45318)

nvd.nist.gov (CVE-2026-45318)

Download JSON