CVE-2023-37267: Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions
Noroxi assessment
Priority: Monitor (action score 39/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.71% (FIRST EPSS); higher than 53.9% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Umbraco.Cms.Infrastructure (NuGet) 11.4.2, 12.0.1, 10.6.1; Umbraco.Cms.Web.BackOffice (NuGet) 11.4.2, 12.0.1, 10.6.1.
- Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 9.8.
Low priority for now. Upgrade to Umbraco.Cms.Infrastructure (NuGet) 11.4.2, 12.0.1, 10.6.1; Umbraco.Cms.Web.BackOffice (NuGet) 11.4.2, 12.0.1, 10.6.1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Jul 13, 2023
- Updated
- Jun 17, 2026
- EPSS
- 0.7% · 53th percentile
- CWE
- CWE-284
Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.7%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 9.8
- CNA · GitHub_M
- 7.5
- 2.3 point gap
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Running WordPress? Scan your site free with WP Lens
Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| umbraco | umbraco cms | cpe:2.3:a:umbraco:umbraco_cms |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- umbraco umbraco cms10.0.0 and later · before 10.6.1
- umbraco umbraco cms11.0.0 and later · before 11.4.2
- umbraco umbraco cms12.0.0 and later · before 12.0.1
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
umbraco Umbraco-CMS
- >= 9.0.0, < 10.6.1, >= 11.0.0, < 11.4.2, = 12.0.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| NuGet | Umbraco.Cms.Infrastructure | from 11.0.0 · before 11.4.2 | 11.4.2 |
| NuGet | Umbraco.Cms.Infrastructure | from 12.0.0 · before 12.0.1 | 12.0.1 |
| NuGet | Umbraco.Cms.Infrastructure | from 9.0.0 · before 10.6.1 | 10.6.1 |
| NuGet | Umbraco.Cms.Web.BackOffice | from 11.0.0 · before 11.4.2 | 11.4.2 |
| NuGet | Umbraco.Cms.Web.BackOffice | from 12.0.0 · before 12.0.1 | 12.0.1 |
| NuGet | Umbraco.Cms.Web.BackOffice | from 9.0.0 · before 10.6.1 | 10.6.1 |
Same product
umbraco: all recordsOther highest-scoring records for the same primary product.
- CVE-2012-10054Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE60This week
- CVE-2025-67288An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code by uploading a crafted PDF file.40Plan
- CVE-2020-5810A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current.40Plan
Published before and after this one in the same product
- ← EarlierCVE-2022-22691Jan 18, 2022 · Umbraco Password Reset URL Poison29Monitor
- ← EarlierCVE-2019-25137May 18, 2023 · Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by authenticated administrators via msxsl:script in an xsltSele29Monitor
- Later →CVE-2023-38694Dec 12, 2023 · Umbraco CMS vulnerable to possible injection of HTML in an unintended form21Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| NuGet:Umbraco.Cms.Infrastructure | 10.6.1 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Infrastructure | 11.4.2 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Infrastructure | 12.0.1 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Web.BackOffice | 10.6.1 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Web.BackOffice | 11.4.2 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Web.BackOffice | 12.0.1 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-284 · Improper Access ControlCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Embedding Scripts within ScriptsCAPEC-19likelihood: High · High
- Malicious Logic InsertionCAPEC-441likelihood: Medium · High
- Modification of Windows Service ConfigurationCAPEC-478likelihood: Low · High
- Malicious Root CertificateCAPEC-479likelihood: Low · Low
- Intent SpoofCAPEC-502
- WebView ExposureCAPEC-503
- Data Injected During ConfigurationCAPEC-536likelihood: Low · High
- Incomplete Data Deletion in a Multi-Tenant EnvironmentCAPEC-546likelihood: Low · Medium
ATT&CK techniques
- RootkitT1014
- Obfuscated Files or Information: Embedded PayloadsT1027.009
- Boot or Logon Initialization ScriptsT1037
- Taint shared contentT1080
- Server Software Component: Terminal Services DLLT1505.005
- Pre-OS Boot:BootkitT1542.003
- Create or Modify System ProcessT1543
- Create or Modify System Process: Launch AgentT1543.001
- Create or Modify System Process:Windows ServiceT1543.003
- Create or Modify System Process: Launch DaemonT1543.004
- Event Triggered Execution:Change Default File AssociationT1546.001
- Event Triggered Execution:.bash_profile and .bashrcT1546.004
- Event Triggered Execution: Accessibility FeaturesT1546.008
- Event Triggered Execution: Installer PackagesT1546.016
- Boot or Logon Autostart ExecutionT1547
- Boot or Logon Autostart Execution:Kernel Modules and ExtensionsT1547.006
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (3 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.