medium5.4
CVE-2026-45318
Open WebUI has stored XSS via unsanitized Office/Excel/DOCX file preview rendering ({@html} without DOMPurify)
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | open-webui | <= 0.9.2 | 0.9.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openwebui | Open Webui | before 0.9.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hcwp-82g6-8wxc
- https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxc
- https://github.com/open-webui/open-webui/security/advisories/GHSA-jwf8-pv5p-vhmc
- https://github.com/open-webui/open-webui/releases/tag/v0.9.3
- https://nvd.nist.gov/vuln/detail/CVE-2026-45318