Umbraco CMS vulnerable to possible injection of HTML in an unintended form
Priority LOW 25CWE-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 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.7.0, and 12.1.0, a user with access to a specific part of the backoffice is able to inject HTML code into a form where it is not intended. Versions 8.18.10, 10.7.0, and 12.1.0 contain a patch for this issue.
Why it matters now
EPSS 0.00411 35th percentileScored 2026-11-07
Fix Fixed Umbraco-CMS (umbraco): 8.18.10, 10.7.0, 12.1.0Umbraco.CMS (NuGet): 8.18.10, 10.7.0, 12.1.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| umbraco | Umbraco-CMS | 8.0.0 to before 8.18.10; 9.0.0-rc001 to before 10.7.0; 11.0.0-rc1 to before 12.1.0 | 8.18.10, 10.7.0, 12.1.0 | Patch available | CNA |
| — | Umbraco.CMS (NuGet) | 8.0.0 to before 8.18.10 | 8.18.10 | Patch available | GHSA-xxc6-35r7-796w |
| — | Umbraco.CMS (NuGet) | 9.0.0 to before 10.7.0 | 10.7.0 | Patch available | GHSA-xxc6-35r7-796w |
| — | Umbraco.CMS (NuGet) | 11.0.0 to before 12.1.0 | 12.1.0 | Patch available | GHSA-xxc6-35r7-796w |
- Umbraco-CMS Vendorumbraco Affected 8.0.0 to before 8.18.10; 9.0.0-rc001 to before 10.7.0; 11.0.0-rc1 to before 12.1.0 Fixed in 8.18.10, 10.7.0, 12.1.0 Patch available CNA
- Umbraco.CMS (NuGet) Vendor— Affected 8.0.0 to before 8.18.10 Fixed in 8.18.10 Patch available GHSA-xxc6-35r7-796w
- Umbraco.CMS (NuGet) Vendor— Affected 9.0.0 to before 10.7.0 Fixed in 10.7.0 Patch available GHSA-xxc6-35r7-796w
- Umbraco.CMS (NuGet) Vendor— Affected 11.0.0 to before 12.1.0 Fixed in 12.1.0 Patch available GHSA-xxc6-35r7-796w
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* | 8.0.0 to before 8.18.10; 9.0.0 to before 10.7.0; 11.0.0 to before 12.1.0 | Vulnerable | umbraco |
- cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.18.10; 9.0.0 to before 10.7.0; 11.0.0 to before 12.1.0 Vulnerable ·umbraco
Remediation
- Fix · CNA Umbraco-CMS (umbraco) Fixed in 8.18.10, 10.7.0, 12.1.0
- Fix · GHSA-xxc6-35r7-796w Umbraco.CMS (NuGet) Fixed in 8.18.10 Advisory →
- Fix · GHSA-xxc6-35r7-796w Umbraco.CMS (NuGet) Fixed in 10.7.0 Advisory →
- Fix · GHSA-xxc6-35r7-796w Umbraco.CMS (NuGet) Fixed in 12.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-38694
- 2026-10-03 Alias added: GHSA-xxc6-35r7-796w
References
More Umbraco Cms vulnerabilities
- 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
Sources
- CVE-2023-38694 · CVE Program
- CVE-2023-38694 · NVD
- FIRST EPSS
- GHSA-xxc6-35r7-796w · GitHub Advisory Database · CC BY 4.0
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