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CVE-2023-49273

Umbraco CMS vulnerable to Privilege Escalation using Spoofing

5.4 MediumFix available

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.37%Up 0.3 points since Dec 13, 2023
90%50%10%1%

What each source reports

CVE List Score used 5.4

Umbraco CMS vulnerable to Privilege Escalation using Spoofing

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Record
CVE-2023-49273
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2023-3183 5.4

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Record
EUVD-2023-3183
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-cfr5-7p54-4qg8 5.4

Privilege Escalation using Spoofing

Impact

Users with low privileges ( Editor, etc) are able to access some unintended endpoints.

Explanation of the vulnerability

Possible to delete redirect urls, when disabled by admin with only access to backoffice Possible to access the examine dashboard with only access to backoffice Possible to access the published cache dashboard with only access to backoffice Possible to access the telemetry dashboard with only access to backoffice Possible to access the languages with only access to backoffice Possible to access the stylesheets with only access to backoffice

Record
GHSA-cfr5-7p54-4qg8
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
NVD 5.4

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Record
CVE-2023-49273
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSV 5.4

Umbraco CMS vulnerable to Privilege Escalation using Spoofing

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, users with low privileges (Editor, etc.) are able to access some unintended endpoints. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Record
CVE-2023-49273
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVGHSA-cfr5-7p54-4qg8 5.4

Privilege Escalation using Spoofing

Impact

Users with low privileges ( Editor, etc) are able to access some unintended endpoints.

Explanation of the vulnerability

Possible to delete redirect urls, when disabled by admin with only access to backoffice Possible to access the examine dashboard with only access to backoffice Possible to access the published cache dashboard with only access to backoffice Possible to access the telemetry dashboard with only access to backoffice Possible to access the languages with only access to backoffice Possible to access the stylesheets with only access to backoffice

Record
GHSA-cfr5-7p54-4qg8
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
Umbraco.CMS
NuGet
 8.0.0 up to 8.18.10
8.18.10
Umbraco.CMS
NuGet
 9.0.0 up to 10.8.1
10.8.1
Umbraco.CMS
NuGet
 11.0.0 up to 12.3.4
12.3.4
Umbraco.CMS
NuGet
 9.0.0 up to 10.8.1, 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-rc10.6.110.7.010.7.0-rc10.8.010.8.0-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-rc2
10.8.1
Umbraco.CMS
NuGet
 11.0.0 up to 12.3.4, plus listed versions
11.1.011.1.0-rc11.2.011.2.0-rc11.2.1
Show 28 moreShow less
11.2.211.3.011.3.0-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-rc512.0.112.1.012.1.0-rc12.1.112.1.212.2.012.2.0-rc12.3.012.3.0-rc12.3.112.3.212.3.3
12.3.4

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-2023-49273 is a medium vulnerability (CVSS 5.4) 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 0.37%, the 30th percentile. Fixed in Umbraco.CMS 8.18.10.

References

This page doesn't list everything

Left out here: 5 versions. The JSON record has them.

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