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.NET
.NET NuGet
Not in CISA KEV
NONE severity

Possible injection of HTML into user invite mailsGHSA-xxc6-35r7-796w

NONE

GHSA-xxc6-35r7-796w is a none-severity (CVSS 0) Cross-site Scripting (XSS) vulnerability in Umbraco.CMS. A fix is available for Umbraco.CMS — see the affected versions and patch details below.

Also known asCVE-2023-38694
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs36th percentile — riskier than 36% of all scored CVEsHighest risk
0.00%0.33%0.66%0.99%0.5%0.4%May 26Sep 26Nov 26

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

3 pkgs affected
.NETUmbraco.CMS.NETUmbraco.CMS.NETUmbraco.CMS

Real-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

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.7.0, and 12.1.0, a user with access to a specific part of the backoffice is able to inject HTML code into a form where it is not intended. Versions 8.18.10, 10.7.0, and 12.1.0 contain a patch for this issue.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetUmbraco.CMS≥ 8.0.0&&< 8.18.108.18.10dotnet add package Umbraco.CMS --version 8.18.10
.NETNuGetUmbraco.CMS≥ 9.0.0&&< 10.7.010.7.0dotnet add package Umbraco.CMS --version 10.7.0
.NETNuGetUmbraco.CMS≥ 11.0.0&&< 12.1.012.1.0dotnet add package Umbraco.CMS --version 12.1.0

Affected Products

1 product · 3 configurations
Application
umbraco cmsumbraco
≥ 11.0.0 && < 12.1.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    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.

  2. Fix

    Update Umbraco.CMS to 8.18.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xxc6-35r7-796w is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

#### Impact A user with access to a specific part of the backoffice is able to inject HTML code into a form where it is not intended. #### Explanation of the vulnerability A person with access to the backoffice and the "users" section could send a user invite and inject HTML code into the invite message.
O3 Security · Impact-Aware SCA

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Possible injection of HTML into user invite mails (None 0)