CVE-2026-45318

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.

• CWE-79

• https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxcExploit, Mitigation, Vendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxcExploit, Mitigation, Vendor Advisory

Published

May 15, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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