Security readout for executives and security teams
Plain-English summary
Affected Umbraco CMS versions can, under rare restart conditions, let an unauthorized user reach admin-level backoffice permissions. That means website content, configuration, and administrative data could be exposed or changed. The issue is high severity but has high attack complexity and no cited evidence of active exploitation.
Executive priority
Patch on a near-term high-priority schedule for any affected production Umbraco site. The exploit conditions appear constrained, but the business impact of unauthorized admin access is significant enough to avoid deferral.
Technical view
CVE-2023-37267 is an improper access control issue in Umbraco CMS. The CVSS 3.1 vector is 7.5 high: network attack vector, no privileges required, user interaction required, high complexity, and high confidentiality, integrity, and availability impact. Patched versions are 10.6.1, 11.4.2, and 12.0.1.
Likely exposure
Exposure is limited to Umbraco CMS >=9.0.0 and <10.6.1, >=11.0.0 and <11.4.2, or exactly 12.0.0. Organizations with internet-facing Umbraco backoffice access should treat this as higher operational priority, especially where restart events are common.
Exploitation context
The source bundle describes rare restart conditions and does not provide public exploit details. KEV status is false, so active exploitation should not be assumed from these sources. The impact is still serious because successful abuse could result in admin-level backoffice access.
Researcher notes
Evidence is strongest for affected versions, CVSS, CWE-284 classification, and patched releases. The bundle does not establish exploit availability, active exploitation, or detailed trigger conditions beyond rare restart behavior. Avoid claims beyond the advisory and CVE data.
Mitigation direction
- Upgrade affected Umbraco 10 deployments to 10.6.1 or later.
- Upgrade affected Umbraco 11 deployments to 11.4.2 or later.
- Upgrade Umbraco 12.0.0 deployments to 12.0.1 or later.
- Review the Umbraco advisory before relying on compensating controls.
- Limit backoffice exposure where possible while upgrades are scheduled.
Validation and detection
- Inventory all Umbraco CMS instances and record exact versions.
- Compare versions against the affected ranges in the advisory.
- Verify upgraded systems report 10.6.1, 11.4.2, 12.0.1, or later.
- Review admin and backoffice activity around restart windows for anomalies.
- Confirm upgrade evidence is captured in vulnerability management records.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-37267 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-h8wc-r4jh-mg7mCVE reference · x_refsource_CONFIRM
- https://github.com/umbraco/Umbraco-CMS/commit/1f26f2c6f3428833892cde5c6d8441fb041e410eCVE reference · x_refsource_MISC
- https://github.com/umbraco/Umbraco-CMS/commit/20a4e475c8d7b91d263e4e103ef19f3644e7b569CVE reference · x_refsource_MISC
- https://github.com/umbraco/Umbraco-CMS/commit/82eae48d098b9deecbdf86cf288b2b18020e1fedCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.