CVE-2026-46609 json
Umbraco.Cms: XSS/HTML Injection in Umbraco Backoffice confirmation dialog
published 2026-05-21 5 mo ago modified 2026-10-26 13 d ago also GHSA-vr9v-27gg-qgx4 , EUVD-2026-36070
- cvss
- 4.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- nuget Umbraco.Cms 17.4.0
- umbraco umbraco_cms 17.4.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 4.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Umbraco.Cms | >=14.0.0, <17.4.0 |
17.4.0 |
Affected products
- umbraco Umbraco-CMS
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/umbraco/Umbraco-CMS/security/advisories/GHSA-vr9v-27gg-qgx4
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-46609
advisory
-
github.com
/umbraco/Umbraco-CMS
package
Sources
- CVE List CVE-2026-46609
- GitHub Advisory GHSA-vr9v-27gg-qgx4
- NVD CVE-2026-46609
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.