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CVE Vulnerability Details :

CVE-2026-45318

PUBLISHED

More Info Official Page

Assigner-GitHub_M

Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa

Published At-15 May, 2026 | 21:28

Updated At-15 May, 2026 | 21:28

▼CVE Numbering Authority (CNA)

Open WebUI: Stored XSS via unsanitized Office/Excel/DOCX file preview rendering ({@html} without DOMPurify)

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 Products

Vendor

open-webui

Product

open-webui

Versions

Affected

< 0.9.3

Problem Types

Type	CWE ID	Description
CWE	CWE-79	CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Type: CWE

CWE ID: CWE-79

Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Metrics

Version	Base score	Base severity	Vector
3.1	5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Version: 3.1

Base score: 5.4

Base severity: MEDIUM

Vector:

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

References

Hyperlink	Resource
https://github.com/open-webui/open-webui/security/advisories/GHSA-hcwp-82g6-8wxc	x_refsource_CONFIRM

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

Resource:

x_refsource_CONFIRM

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