CVE-2025-24012: Umbraco Backoffice Components Have XSS/HTML Injection Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-21 · updated 2026-06-17
Weakness: CWE-79

Description

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.

Affected products

Umbraco-CMS: from 14.0.0 before 14.3.2; from 15.0.0 before 15.1.2 — fixed in 14.3.2, 15.1.2

How to fix

Upgrade to a fixed version: Umbraco-CMS 14.3.2, 15.1.2. Check the vendor advisory for mitigations.

References

https://github.com/umbraco/Umbraco-CMS/commit/d4f8754f933895b3a329296e25ddea6f84a0aea2
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-wv8v-rmw2-25wc

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