# CVE-2023-37267: Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions > Attackers can gain unauthorized admin access to the Umbraco backoffice under rare conditions following a restart. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 13 Jul 2023 - **Updated:** 31 Oct 2024 - **Also known as:** GHSA-h8wc-r4jh-mg7m ## What is CVE-2023-37267? CVE-2023-37267 is a high-severity authentication bypass vulnerability in Umbraco Umbraco Cms, published on 13 Jul 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official 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. Weakness: CWE-284 (Improper Access Control) ## Which versions are affected by CVE-2023-37267? 12 open source packages ship an affected version, including Umbraco.Cms.Infrastructure and Umbraco.Cms.Web.BackOffice. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `Umbraco.Cms.Infrastructure` | NuGet | From 11.0.0 | 11.4.2 | | `Umbraco.Cms.Infrastructure` | NuGet | From 11.0.0 | 11.4.2 | | `Umbraco.Cms.Infrastructure` | NuGet | From 12.0.0 | 12.0.1 | | `Umbraco.Cms.Infrastructure` | NuGet | From 12.0.0 | 12.0.1 | | `Umbraco.Cms.Infrastructure` | NuGet | From 9.0.0 | 10.6.1 | | `Umbraco.Cms.Infrastructure` | NuGet | From 9.0.0 | 10.6.1 | | `Umbraco.Cms.Web.BackOffice` | NuGet | From 11.0.0 | 11.4.2 | | `Umbraco.Cms.Web.BackOffice` | NuGet | From 11.0.0 | 11.4.2 | | `Umbraco.Cms.Web.BackOffice` | NuGet | From 12.0.0 | 12.0.1 | | `Umbraco.Cms.Web.BackOffice` | NuGet | From 12.0.0 | 12.0.1 | | `Umbraco.Cms.Web.BackOffice` | NuGet | From 9.0.0 | 10.6.1 | | `Umbraco.Cms.Web.BackOffice` | NuGet | From 9.0.0 | 10.6.1 | Products: Umbraco Umbraco Cms. ## How do I fix CVE-2023-37267? Upgrade Umbraco.Cms.Infrastructure to a fixed version for your release line: 11.4.2, 12.0.1 or 10.6.1. ## Is CVE-2023-37267 being exploited? There is no known exploitation of CVE-2023-37267 in the wild and no public exploit code. ## Other vulnerabilities in Umbraco Umbraco Cms - [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0) - [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8) - [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8) - [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3) - [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-37267 and fix it if it is affected. What it is: CVE-2023-37267 is a high-severity authentication bypass vulnerability in Umbraco Umbraco Cms, published on 13 Jul 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2023-37267 in the wild and no public exploit code. Affected packages and fixed versions: - Umbraco.Cms.Infrastructure (NuGet): affected from 11.0.0; fixed in 11.4.2 - Umbraco.Cms.Infrastructure (NuGet): affected from 11.0.0; fixed in 11.4.2 - Umbraco.Cms.Infrastructure (NuGet): affected from 12.0.0; fixed in 12.0.1 - Umbraco.Cms.Infrastructure (NuGet): affected from 12.0.0; fixed in 12.0.1 - Umbraco.Cms.Infrastructure (NuGet): affected from 9.0.0; fixed in 10.6.1 - Umbraco.Cms.Infrastructure (NuGet): affected from 9.0.0; fixed in 10.6.1 - Umbraco.Cms.Web.BackOffice (NuGet): affected from 11.0.0; fixed in 11.4.2 - Umbraco.Cms.Web.BackOffice (NuGet): affected from 11.0.0; fixed in 11.4.2 - Umbraco.Cms.Web.BackOffice (NuGet): affected from 12.0.0; fixed in 12.0.1 - Umbraco.Cms.Web.BackOffice (NuGet): affected from 12.0.0; fixed in 12.0.1 - Umbraco.Cms.Web.BackOffice (NuGet): affected from 9.0.0; fixed in 10.6.1 - Umbraco.Cms.Web.BackOffice (NuGet): affected from 9.0.0; fixed in 10.6.1 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-37267/ (Markdown: https://insights.sbomify.com/CVE-2023-37267/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-37267 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-37267 - OSV: https://osv.dev/vulnerability/CVE-2023-37267 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-37267/ Summaries are generated and may contain mistakes; the official description above is the record.