Umbraco CMS vulnerable to stored Cross-site Scripting in the "dictionary name" on Dictionary section

published 2024-10-22 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-3012 , GHSA-c5g6-6xf7-qxp3

cvss: 4.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

Umbraco, a free and open source .NET content management system, has a cross-site scripting vulnerability starting in version 14.0.0 and prior to versions 14.3.1 and 15.0.0. This can be leveraged to gain access to higher-privilege endpoints, e.g. if you get a user with admin privileges to run the code, you can potentially elevate all users and grant them admin privileges or access protected content. Versions 14.3.1 and 15.0.0 contain a patch. As a workaround, ensure that access to the Dictionary section is only granted to trusted users.

Patch / fix

fixed in 4

nuget Umbraco.Cms.StaticAssets 14.3.1
npm @umbraco-cms/backoffice 14.3.1
umbraco umbraco_cms 14.3.1
umbraco umbraco_cms_backoffice 14.3.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-10-22)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.2	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
GitHub	3.1	4.2	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
NVD	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
nuget	Umbraco.Cms.StaticAssets	>=14.0.0, <14.3.1	14.3.1
npm	@umbraco-cms/backoffice	>=14.0.0, <14.3.1	14.3.1

Affected products

umbraco Umbraco-CMS
umbraco umbraco_cms

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page

References

github.com /umbraco/Umbraco-CMS/security/advisories/GHSA-c5g6-6xf7-qxp3
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2024-47819
advisory
github.com /umbraco/Umbraco-CMS
package

Sources

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary