Authorization bypass through user-controlled key in Umbraco CMS - CVE-2026-31832
Published: May 5, 2026
Vulnerability identifier: #VU130187
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31832
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Umbraco
Affected software:
Umbraco CMS
Umbraco CMS
Detailed vulnerability description
The vulnerability allows a remote user to modify domain-related data for content nodes without proper authorization.
The vulnerability exists due to broken object-level authorization in a backoffice API endpoint when handling API requests to assign domains to content nodes. A remote user can send a crafted API request to modify domain-related data for content nodes without proper authorization.
This may result in malicious or unintended routing behavior, service disruption, and potential disclosure of configuration-related information.
How to mitigate CVE-2026-31832
Install security update from vendor's website.