XSS/HTML Injection Vulnerability in Umbraco Preview BadgeGHSA-69cg-w8vm-h229
MEDIUMGHSA-69cg-w8vm-h229 is a medium-severity (CVSS 4.3) Cross-site Scripting (XSS) vulnerability in Umbraco.Cms. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for Umbraco.Cms — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-69cg-w8vm-h229.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
Umbraco.Cms.NETUmbraco.Cms.NETUmbraco.Cms.NETUmbraco.Cms.NETUmbraco.Cms.Web.Common.NETUmbraco.Cms.Web.Common.NETUmbraco.Cms.Web.Common.NETUmbraco.Cms.Web.CommonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
A vulnerability was found in Umbraco CMS up to 10.7.7/12.3.6/13.5.2/14.3.1/15.1.1. It has been classified as problematic. Affected is an unknown function of the file /Umbraco/preview/frame?id{} of the component Dashboard. The manipulation of the argument culture leads to cross site scripting. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 10.8.8, 13.5.3, 14.3.2 and 15.1.2 is able to address this issue. It is recommended to upgrade the affected component.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Umbraco.Cms | ≥ 11.0.0&&< 13.5.3 | 13.5.3dotnet add package Umbraco.Cms --version 13.5.3 |
| .NETNuGet | Umbraco.Cms | ≥ 14.0.0&&< 14.3.2 | 14.3.2dotnet add package Umbraco.Cms --version 14.3.2 |
| .NETNuGet | Umbraco.Cms | ≥ 15.0.0&&< 15.1.2 | 15.1.2dotnet add package Umbraco.Cms --version 15.1.2 |
| .NETNuGet | Umbraco.Cms | ≥ 10.8.7&&< 10.8.8 | 10.8.8dotnet add package Umbraco.Cms --version 10.8.8 |
| .NETNuGet | Umbraco.Cms.Web.Common | ≥ 11.0.0&&< 13.5.3 | 13.5.3dotnet add package Umbraco.Cms.Web.Common --version 13.5.3 |
| .NETNuGet | Umbraco.Cms.Web.Common | ≥ 14.0.0&&< 14.3.2 | 14.3.2dotnet add package Umbraco.Cms.Web.Common --version 14.3.2 |
Affected Products
umbraco cmsumbracoResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Umbraco.Cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Umbraco.Cms to 13.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-69cg-w8vm-h229 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is GHSA-69cg-w8vm-h229 in your dependencies?
Find it across NuGet, including transitive dependencies.