CVE-2023-37267 is a high-severity (CVSS 7.5) CWE-284 vulnerability in Umbraco.Cms.Infrastructure. A fix is available for Umbraco.Cms.Infrastructure — see the affected versions and patch details below.
Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-37267.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2023-37267 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
Umbraco.Cms.Infrastructure.NETUmbraco.Cms.Infrastructure.NETUmbraco.Cms.Infrastructure.NETUmbraco.Cms.Web.BackOffice.NETUmbraco.Cms.Web.BackOffice.NETUmbraco.Cms.Web.BackOfficeReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
Under rare conditions, a restart of Umbraco can allow unauthorized users to gain admin-level permissions.
Impact
An unauthorized user gaining admin-level access and permissions to the backoffice.
Patches
10.6.1, 11.4.2, 12.0.1
Workarounds
- Enabling the Unattended Install feature will mean the vulnerability is not exploitable.
- Enabling IP restrictions to
*/install/*and*/umbraco/*will limit the exposure to allowed IP addresses.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Umbraco.Cms.Infrastructure | ≥ 9.0.0&&< 10.6.1 | 10.6.1dotnet add package Umbraco.Cms.Infrastructure --version 10.6.1 |
| .NETNuGet | Umbraco.Cms.Infrastructure | ≥ 11.0.0&&< 11.4.2 | 11.4.2dotnet add package Umbraco.Cms.Infrastructure --version 11.4.2 |
| .NETNuGet | Umbraco.Cms.Infrastructure | ≥ 12.0.0&&< 12.0.1 | 12.0.1dotnet add package Umbraco.Cms.Infrastructure --version 12.0.1 |
| .NETNuGet | Umbraco.Cms.Web.BackOffice | ≥ 9.0.0&&< 10.6.1 | 10.6.1dotnet add package Umbraco.Cms.Web.BackOffice --version 10.6.1 |
| .NETNuGet | Umbraco.Cms.Web.BackOffice | ≥ 11.0.0&&< 11.4.2 | 11.4.2dotnet add package Umbraco.Cms.Web.BackOffice --version 11.4.2 |
| .NETNuGet | Umbraco.Cms.Web.BackOffice | ≥ 12.0.0&&< 12.0.1 | 12.0.1dotnet add package Umbraco.Cms.Web.BackOffice --version 12.0.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Umbraco.Cms.Infrastructure, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Umbraco.Cms.Infrastructure to 10.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-37267 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2023-37267 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2023-37267. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-37267 in your dependencies?
O3 Security finds CVE-2023-37267 across NuGet dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.