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CVE-2023-37267

29
FAUCET Score

CVE-2023-37267 is a critical vulnerability affecting Umbraco CMS, an ASP.NET content management system. Under rare restart conditions, it allows unauthorized users to gain administrative access. With a CVSS score of 9.8 (CRITICAL), this vulnerability has a network attack vector, low attack complexity, and can lead to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community attention with 10 mentions, indicating awareness among security researchers. Patches are available in Umbraco versions 10.6.1, 11.4.2, and 12.0.1.

Impacted Technologies

VendorProductVersion(s)CPE
>= 10.0.0, < 10.6.1CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*
>= 11.0.0, < 11.4.2CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*
>= 12.0.0, < 12.0.1CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.71%
Probability of exploitation in next 30 days
EPSS Percentile
49.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 32nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: Umbraco.Cms.InfrastructureFixed in: 10.6.1
nugetpatch availablevia ghsa
Product: Umbraco.Cms.InfrastructureFixed in: 11.4.2
nugetpatch availablevia ghsa
Product: Umbraco.Cms.InfrastructureFixed in: 12.0.1
nugetpatch availablevia ghsa
Product: Umbraco.Cms.Web.BackOfficeFixed in: 10.6.1
nugetpatch availablevia ghsa
Product: Umbraco.Cms.Web.BackOfficeFixed in: 11.4.2
nugetpatch availablevia ghsa
Product: Umbraco.Cms.Web.BackOfficeFixed in: 12.0.1

Vendor Advisories (1)

nugetGHSA-h8wc-r4jh-mg7mhigh

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

Jul 13, 2023

References

github.com / umbraco/Umbraco-CMS/commit/1f26f2c6f3428833892cde5c6d8441fb041e410e
Patch
github.com / umbraco/Umbraco-CMS/commit/20a4e475c8d7b91d263e4e103ef19f3644e7b569
Patch
github.com / umbraco/Umbraco-CMS/commit/82eae48d098b9deecbdf86cf288b2b18020e1fed
Patch
github.com / umbraco/Umbraco-CMS/security/advisories/GHSA-h8wc-r4jh-mg7m
Vendor Advisory