CVE-2026-45318 — MEDIUM (5.4)

Q: How severe is CVE-2026-45318?

CVE-2026-45318 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-45318?

Check the references section above for vendor advisories and patch information. Affected products include: Openwebui Open Webui.

Vulnerability 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.

CVSS Score

5.4

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Openwebui	Open Webui	< 0.9.3

Related Weaknesses (CWE)

CWE-79

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxcExploitMitigationVendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxcExploitMitigationVendor Advisory

FAQ

What is CVE-2026-45318?

CVE-2026-45318 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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). ...

How severe is CVE-2026-45318?

CVE-2026-45318 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-45318?

Check the references section above for vendor advisories and patch information. Affected products include: Openwebui Open Webui.