Report: CVE-2026-45318 - Open WebUI: Stored XSS via unsanitized Office/Excel/DOCX file preview rendering

Report: CVE-2026-45318 - Open WebUI: Stored XSS via unsanitized Office/Excel/DOCX file preview rendering

CVE ID :CVE-2026-45318 Published : May 15, 2026, 10:16 p.m. | 1 hour, 9 minutes ago 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. Severity: 5.4 | MEDIUM Visit the link for more details, such as CVSS details, affected products, timeline, and more...

CVE Details

Severity
MEDIUM
Published
May 15, 2026
Impact: XSS