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CVE-2023-37267

Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions

7.5 HighFix available

Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.71%Up 0.7 points since Jul 14, 2023
90%50%10%1%

What each source reports

CVE List Score used 7.5

Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions

Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.

Record
CVE-2023-37267
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-284
Updated
2026-11-02
EUVDEUVD-2023-2073 7.5

Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.

Record
EUVD-2023-2073
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-h8wc-r4jh-mg7m 7.5

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.
Record
GHSA-h8wc-r4jh-mg7m
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-284
Updated
2026-11-02
NVD 7.5

Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.

Record
CVE-2023-37267
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-284
Updated
2026-11-02
OSV 7.5

Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions

Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability was patched in versions 10.6.1, 11.4.2 and 12.0.1.

Record
CVE-2023-37267
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-284
Updated
2026-11-02
OSVGHSA-h8wc-r4jh-mg7m 7.5

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.
Record
GHSA-h8wc-r4jh-mg7m
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-284
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
Umbraco.Cms.Infrastructure
NuGet
 9.0.0 up to 10.6.1
10.6.1
Umbraco.Cms.Infrastructure
NuGet
 11.0.0 up to 11.4.2
11.4.2
Umbraco.Cms.Infrastructure
NuGet
 12.0.0 to 12.0.0
12.0.1
Umbraco.Cms.Web.BackOffice
NuGet
 9.0.0 up to 10.6.1
10.6.1
Umbraco.Cms.Web.BackOffice
NuGet
 11.0.0 up to 11.4.2
11.4.2
Umbraco.Cms.Web.BackOffice
NuGet
 12.0.0 to 12.0.0
12.0.1
Umbraco.Cms.Infrastructure
NuGet
 9.0.0 up to 10.6.1, plus listed versions
10.0.010.0.0-rc510.0.110.1.010.1.0-rc
Show 41 moreShow less
10.1.0-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-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-rc39.5.19.5.29.5.39.5.4
10.6.1
Umbraco.Cms.Infrastructure
NuGet
 11.0.0 up to 11.4.2, plus listed versions
11.1.011.1.0-rc11.2.011.2.0-rc11.2.1
Show 7 moreShow less
11.2.211.3.011.3.0-rc11.3.111.4.011.4.0-rc11.4.1
11.4.2
Umbraco.Cms.Infrastructure
NuGet
 12.0.0 up to 12.0.1
12.0.1
Umbraco.Cms.Web.BackOffice
NuGet
 9.0.0 up to 10.6.1, plus listed versions
10.0.010.0.0-rc110.0.0-rc210.0.0-rc310.0.0-rc4
Show 45 moreShow less
10.0.0-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-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-rc39.5.19.5.29.5.39.5.4
10.6.1
Umbraco.Cms.Web.BackOffice
NuGet
 11.0.0 up to 11.4.2, plus listed versions
11.1.011.1.0-rc11.2.011.2.0-rc11.2.1
Show 7 moreShow less
11.2.211.3.011.3.0-rc11.3.111.4.011.4.0-rc11.4.1
11.4.2
Umbraco.Cms.Web.BackOffice
NuGet
 12.0.0 up to 12.0.1
12.0.1

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-37267 is a high vulnerability (CVSS 7.5) in Umbraco Cms, published July 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.71%, the 53rd percentile. Fixed in Umbraco.Cms.Infrastructure 10.6.1.

References

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