CVE-2026-46609
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
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.
- Record
CVE-2026-46609- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2026-36070
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.
- Record
EUVD-2026-36070- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-vr9v-27gg-qgx4
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
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
- Record
GHSA-vr9v-27gg-qgx4- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-46609- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
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.
- Record
CVE-2026-46609- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-vr9v-27gg-qgx4
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
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
- Record
GHSA-vr9v-27gg-qgx4- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
Umbraco.CmsNuGet |
14.0.0 to 17.3.5 | 17.4.0 |
Umbraco.CmsNuGet |
14.0.0 up to 17.4.0, plus listed versions 14.1.014.1.0-rc14.1.0-rc214.1.114.1.2 Show 45 moreShow less14.2.014.2.0-rc14.2.0-rc214.2.0-rc314.3.014.3.0-rc14.3.114.3.214.3.314.3.415.0.015.0.0-rc115.0.0-rc215.0.0-rc315.0.0-rc415.1.015.1.0-rc15.1.0-rc215.1.115.1.215.2.015.2.0-rc15.2.115.2.215.2.315.3.015.3.0-rc15.3.0-rc215.3.115.4.015.4.0-rc15.4.0-rc215.4.115.4.215.4.315.4.416.0.016.0.0-rc16.0.0-rc216.0.0-rc316.0.0-rc416.0.0-rc516.0.0-rc616.1.016.1.0-rc |
17.4.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-46609 is a medium vulnerability (CVSS 4.6) in Umbraco Cms, published May 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in Umbraco.Cms 17.4.0.
References
Left out here: 47 versions. The JSON record has them.