Medium severity · published Jun 10, 2026
CVE-2026-46609
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
4.6
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UM
Umbraco-CMS · umbraco
>= 14.0.0, < 17.4.0 · source: vendor
UC
Umbraco Cms · Umbraco
14.0.0 before 17.4.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46609
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46609
Vendor Advisory
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vr9v-27gg-qgx4
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