CVE-2026-45318

MediumCVSS 5.4/10Last modified Nov 11, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
open-webui	open-webui	< 0.9.3

References

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

Timeline

Published: May 15, 2026
Last modified: Nov 11, 2026
NVD status: Analyzed

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