CVE-2026-46609 — Umbraco.Cms: XSS/HTML Injection in Umbraco.Cms —...

MEDIUM

Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog

Published May 21, 2026Updated June 10, 2026Source: osv

Summary

### Impact Authenticated users are able to inject HTML vulnerability into an input field, which is rendered in the confirmation dialog without proper output encoding. ### Patches This issue has been patched in 17.4.0

Advisory Timeline

First published May 21, 2026 (144 days ago).
Last revised June 10, 2026 — 20 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet

Update Umbraco.Cms to 17.4.0 or later

dotnet add package Umbraco.Cms --version 17.4.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

Package	Ecosystem	Affected	Fixed In
Umbraco.Cms	nuget	14.0.0, 14.1.0, 14.1.0-rc, 14.1.0-rc2 (+94 more)	17.4.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-79
Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 4.6 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

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

References

Frequently Asked Questions

What is CVE-2026-46609?: Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 4.6/10).
How do I check if my project is affected by CVE-2026-46609?: CVE-2026-46609 affects Umbraco.Cms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-46609 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

4.6

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-vr9v-27gg-qgx4

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