CVE-2026-46609

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

State: Published
Severity: 4.6 Medium
Published: Jun 10, 2026
Updated: Jun 10, 2026
Reserved: May 15, 2026

Description

Umbraco is an ASP.NET CMS. From version 14.0.0 to before version 17.4.0, authenticated users are able to inject HTML into an input field, which is rendered in the confirmation dialog without proper output encoding. This issue has been patched in version 17.4.0.

Scores

CVSS	Score	Vector	Source
3.1	4.6 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
Umbraco-CMSumbraco	>= 14.0.0, < 17.4.0Affected

References

https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vr9v-27gg-qgx4

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