Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Umbraco.Cms.Infrastructure | >= 9.0.0, < 10.6.1, >= 11.0.0, < 11.4.2, >= 12.0.0, < 12.0.1 | 10.6.1, 11.4.2, 12.0.1 |
| .NET (NuGet) | Umbraco.Cms.Web.BackOffice | >= 9.0.0, < 10.6.1, >= 11.0.0, < 11.4.2, >= 12.0.0, < 12.0.1 | 10.6.1, 11.4.2, 12.0.1 |
References
- https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-h8wc-r4jh-mg7m
- https://nvd.nist.gov/vuln/detail/CVE-2023-37267
- https://github.com/umbraco/Umbraco-CMS/commit/1f26f2c6f3428833892cde5c6d8441fb041e410e
- https://github.com/umbraco/Umbraco-CMS/commit/20a4e475c8d7b91d263e4e103ef19f3644e7b569
- https://github.com/umbraco/Umbraco-CMS/commit/82eae48d098b9deecbdf86cf288b2b18020e1fed
- https://github.com/umbraco/Umbraco-CMS
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-284- Platform
- .NET (NuGet)
- Package
Umbraco.Cms.Infrastructure, Umbraco.Cms.Web.BackOffice- Disclosed
- 13.07.2023
- Updated
- 11.10.2026 11:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-h8wc-r4jh-mg7m - CC BY 4.0
Vulnerability history: Umbraco.Cms.Web.BackOffice
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 07.2023 03.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 3
Disclosures per year
- 2023: 1
- 2024: 2
- 2025: 1
- 2026: 0
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Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions this entry
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