Incorrect authorization in Umbraco CMS - #VU158821
Published: November 3, 2026
Vulnerability identifier: #VU158821
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose relation listings without the required access to the Settings section.
The vulnerability exists due to incorrect authorization in the Umbraco CMS Management API relation-type listing endpoint when checking section access permissions. A remote user can use access to the Content section to list the relations of a relation type despite lacking access to the Settings section.
Affected software
Umbraco CMS
Remediation
Install security update from vendor's website.
Umbraco CMS - addressed in versions 17.7.2, 18.2.2