Open Redirect Bypass Protection
Umbraco is an ASP.NET CMS used by more than 730.000 websites. Umbraco has an endpoint that is vulnerable to open redirects. The endpoint is protected so it requires the user to be signed into backoffice before the vulnerable is exposed. This vulnerability has been patched in version(s) 8.18.14, 10.8.6, 12.3.10 and 13.3.1.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- May 21, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.4% · 29th percentile
- CWE
- CWE-601
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Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.1
- CNA · GitHub_M
- 6.1
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| 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 cms8.18.5 and later · before 8.18.14
- umbraco umbraco cms10.5.0 and later · before 10.8.6
- umbraco umbraco cms12.0.0 and later · before 12.3.10
- umbraco umbraco cms13.0.0 and later · before 13.3.1
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
- >= 8.18.5, < 8.18.14, >= 10.5.0, < 10.8.6, >= 12.0.0, < 12.3.10, >= 13.0.0, < 13.3.1affected
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.Web.BackOffice | from 10.5.0 · before 10.8.6 | 10.8.6 |
| NuGet | Umbraco.Cms.Web.BackOffice | from 12.0.0 · before 12.3.10 | 12.3.10 |
| NuGet | Umbraco.Cms.Web.BackOffice | from 13.0.0 · before 13.3.1 | 13.3.1 |
| NuGet | Umbraco.Cms.Web.BackOffice | from 8.18.5 · before 8.18.14 | 8.18.14 |
| NuGet | UmbracoCms.Core | from 10.5.0 · before 10.8.6 | 10.8.6 |
| NuGet | UmbracoCms.Core | from 12.0.0 · before 12.3.10 | 12.3.10 |
| NuGet | UmbracoCms.Core | from 13.0.0 · before 13.3.1 | 13.3.1 |
| NuGet | UmbracoCms.Core | from 8.18.5 · before 8.18.14 | 8.18.14 |
Same product
umbraco: all recordsOther highest-scoring records for the same primary product.
- 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
- CVE-2014-10074Umbraco before 7.2.0 has a remote PHP code execution vulnerability because Umbraco.Web.UI/config/umbracoSettings.Release.config does not blo40Plan
- CVE-2012-1301The FeedProxy.aspx script in Umbraco 4.7.0 allows remote attackers to proxy requests on their behalf via the "url" parameter.40Plan
- CVE-2023-37267Umbraco allows possible Admin-level access to backoffice without Auth under rare conditions39Monitor
- CVE-2012-10054Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE38Monitor
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.Web.BackOffice | 10.8.6 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Web.BackOffice | 12.3.10 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Web.BackOffice | 13.3.1 | Package registry (OSV) |
| NuGet:Umbraco.Cms.Web.BackOffice | 8.18.14 | Package registry (OSV) |
| NuGet:UmbracoCms.Core | 10.8.6 | Package registry (OSV) |
| NuGet:UmbracoCms.Core | 12.3.10 | Package registry (OSV) |
| NuGet:UmbracoCms.Core | 13.3.1 | Package registry (OSV) |
| NuGet:UmbracoCms.Core | 8.18.14 | 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/umbraco/Umbraco-CMS/commit/5f24de308584b9771240a6db1a34630a5114c450
- github.com/umbraco/Umbraco-CMS/commit/c17d4e1a600098ec524e4126f4395255476bc33f
- github.com/umbraco/Umbraco-CMS/commit/c8f71af646171074c13e5c34f74312def4512031
- github.com/umbraco/Umbraco-CMS/commit/d8df405db4ea884bb4b96f088d10d9a2070cf024
- github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-j74q-mv2c-rxmp
Vendor advisories and official records. Exploit/PoC links are deliberately left out.