CVE-2026-45318

EUVD-2026-30659
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 11%
Affected Products (NVD)
VendorProductVersion
openwebuiopen_webui
𝑥
< 0.9.3
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxc
https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxc