CVE-2023-38694
Umbraco CMS vulnerable to possible injection of HTML in an unintended form
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- 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 vulnerable to possible injection of HTML in an unintended form
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.
- Record
CVE-2023-38694- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2023-3328
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.
- Record
EUVD-2023-3328- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xxc6-35r7-796w
Possible injection of HTML into user invite mails
Impact
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.
Explanation of the vulnerability
A person with access to the backoffice and the "users" section could send a user invite and inject HTML code into the invite message.
- Record
GHSA-xxc6-35r7-796w- CVSS 3.1
- 0.0 None
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2023-38694- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N - CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Umbraco CMS vulnerable to possible injection of HTML in an unintended form
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.
- Record
CVE-2023-38694- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVGHSA-xxc6-35r7-796w
Possible injection of HTML into user invite mails
Impact
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.
Explanation of the vulnerability
A person with access to the backoffice and the "users" section could send a user invite and inject HTML code into the invite message.
- Record
GHSA-xxc6-35r7-796w- CVSS 3.1
- 0.0 None
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
Umbraco.CMSNuGet |
8.0.0 up to 8.18.10 | 8.18.10 |
Umbraco.CMSNuGet |
9.0.0 up to 10.7.0 | 10.7.0 |
Umbraco.CMSNuGet |
11.0.0 up to 12.1.0 | 12.1.0 |
Umbraco.CMSNuGet |
9.0.0 up to 10.7.0, plus listed versions 10.0.010.0.0-rc110.0.0-rc210.0.0-rc310.0.0-rc4 Show 45 moreShow less10.0.0-rc510.0.110.1.010.1.0-rc10.1.0-rc210.1.110.2.010.2.0-rc10.2.110.3.010.3.0-rc10.3.110.3.210.4.010.4.0-rc10.4.110.4.210.5.010.5.0-rc10.5.110.6.010.6.0-rc10.6.110.7.0-rc9.0.19.1.09.1.0-rc9.1.19.1.29.2.09.2.0-rc9.3.09.3.0-rc9.3.19.4.09.4.0-rc9.4.19.4.29.4.39.5.09.5.0-rc9.5.0-rc29.5.0-rc39.5.19.5.2 |
10.7.0 |
Umbraco.CMSNuGet |
11.0.0 up to 12.1.0, plus listed versions 11.1.011.1.0-rc11.2.011.2.0-rc11.2.1 Show 18 moreShow less11.2.211.3.011.3.0-rc11.3.111.4.011.4.0-rc11.4.111.4.211.5.011.5.0-rc12.0.012.0.0-rc112.0.0-rc212.0.0-rc312.0.0-rc412.0.0-rc512.0.112.1.0-rc |
12.1.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-38694 is a low vulnerability (CVSS 3.5) in Umbraco Cms, published December 12, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 35th percentile. Fixed in Umbraco.CMS 8.18.10.
References
Left out here: 2 versions. The JSON record has them.