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TI-2026-34268 Aliases CVE-2026-46609GHSA-vr9v-27gg-qgx4

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

Priority LOW 20CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00136 3rd percentileScored 2026-11-07
Fix Fixed Umbraco-CMS (umbraco): 17.4.0Umbraco.Cms (NuGet): 17.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
umbracoUmbraco-CMS14.0.0 to before 17.4.017.4.0Patch availableCNA
—Umbraco.Cms (NuGet)14.0.0 to before 17.4.017.4.0Patch availableGHSA-vr9v-27gg-qgx4
  • Umbraco-CMS Vendorumbraco Affected 14.0.0 to before 17.4.0 Fixed in 17.4.0 Patch available CNA
  • Umbraco.Cms (NuGet) Vendor— Affected 14.0.0 to before 17.4.0 Fixed in 17.4.0 Patch available GHSA-vr9v-27gg-qgx4

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*14.0.0 to before 17.4.0Vulnerableumbraco
  • cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* Versions 14.0.0 to before 17.4.0 Vulnerable ·umbraco

Remediation

  • Fix · CNA Umbraco-CMS (umbraco) Fixed in 17.4.0
  • Fix · GHSA-vr9v-27gg-qgx4 Umbraco.Cms (NuGet) Fixed in 17.4.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46609
  2. 2026-10-03 Alias added: GHSA-vr9v-27gg-qgx4

References

Advisory 2

Other 1

  • TI-2025-41183 An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute… CVSS 3.1CRITICAL 10.0
  • TI-2012-05477 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE CVSS 4.0CRITICAL 9.3
  • TI-2021-22392 Umbraco v8.14.1 - 'baseUrl' SSRF CVSS 4.0MEDIUM 6.9
  • TI-2024-36846 A stored cross-site scripting (XSS) vulnerability in Umbraco CMS v14.3.1 allows attackers… CVSS 3.1MEDIUM 6.5
  • TI-2019-15240 Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by… CVSS 3.1HIGH 7.2
  • TI-2020-04738 Cross-site scripting in Umbraco CMS CVSS 3.1MEDIUM 5.4
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences