Umbraco Backoffice Components Have XSS/HTML Injection Vulnerability

published 2025-01-21 21 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-0204 , GHSA-wv8v-rmw2-25wc

cvss: 4.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits: 0; none known

Umbraco is a free and open source .NET content management system. Starting in version 14.0.0 and prior to versions 14.3.2 and 15.1.2, authenticated users are able to exploit a cross-site scripting vulnerability when viewing certain localized backoffice components. Versions 14.3.2 and 15.1.2 contain a patch.

Patch / fix

fixed in 4 links 1

nuget Umbraco.Cms.StaticAssets 14.3.2, 15.1.2
npm @umbraco-cms/backoffice 14.3.2, 15.1.2
umbraco umbraco_cms 14.3.2, 15.1.2
umbraco umbraco_cms_backoffice 14.3.2, 15.1.2

github.com/umbraco/Umbraco-CMS@d4f8754 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 21 mo ago (2025-01-21)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% 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
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
nuget	Umbraco.Cms.StaticAssets	>=14.0.0, <14.3.2 >=15.0.0, <15.1.2	14.3.2 15.1.2
npm	@umbraco-cms/backoffice	>=14.0.0, <14.3.2 >=15.0.0, <15.1.2	14.3.2 15.1.2

Affected products

umbraco Umbraco-CMS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /umbraco/Umbraco-CMS/commit/d4f8754f933895b3a329296e25ddea6f84a0aea2
web, patch
github.com /umbraco/Umbraco-CMS/security/advisories/GHSA-wv8v-rmw2-25wc
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2025-24012
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