Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M
CVE-2026-46609Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
Medium 4.6
In plain English
A medium-severity cross-site scripting in Umbraco-CMS from umbraco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.6Medium
Exploit odds (30 days)0.1%top 96.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Umbraco is an ASP.NET CMS. From version 14.0.0 to before version 17.4.0, authenticated users are able to inject HTML into an input field, which is rendered in the confirmation dialog without proper output encoding. This issue has been patched in version 17.4.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | umbraco.cms | 17.4.0 | GHSA-vr9v-27gg-qgx4 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| umbraco | Umbraco-CMS | >= 14.0.0, < 17.4.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
References
- https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vr9v-27gg-qgx4 x_refsource_CONFIRM