CVE-2026-45318

Name: CVE-2026-45318
Creator: NVD / NIST
Published: 2026-05-15T22:16:54.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-45318 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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). EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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

5.4/10

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

EPSS Probability

0.21%

11.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Openwebui	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: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-45318?

How severe is CVE-2026-45318?

CVE-2026-45318 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45318?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-45318?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST