Umbraco is an ASP.NET CMS. From 15.3.1 to before 16.5.1 and 17.2.2, A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient authorization enforcement when modifying user group memberships. The affected functionality does not properly validate whether a user has sufficient privileges to assign highly privileged roles. This vulnerability is fixed in 16.5.1 and 17.2.2.
Metrics
Affected Vendors & Products
References
History
Wed, 11 Mar 2026 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 11 Mar 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Umbraco
Umbraco umbraco Cms |
|
| Vendors & Products |
Umbraco
Umbraco umbraco Cms |
Tue, 10 Mar 2026 22:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Umbraco is an ASP.NET CMS. From 15.3.1 to before 16.5.1 and 17.2.2, A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient authorization enforcement when modifying user group memberships. The affected functionality does not properly validate whether a user has sufficient privileges to assign highly privileged roles. This vulnerability is fixed in 16.5.1 and 17.2.2. | |
| Title | Umbraco Affected by Vertical Privilege Escalation via Missing Authorization Checks | |
| Weaknesses | CWE-269 CWE-284 CWE-862 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-10T21:53:49.153Z
Updated: 2026-03-11T15:58:38.854Z
Reserved: 2026-03-09T17:41:56.077Z
Link: CVE-2026-31834
Updated: 2026-03-11T15:52:29.661Z
Status : Awaiting Analysis
Published: 2026-03-10T22:16:21.567
Modified: 2026-03-11T13:52:47.683
Link: CVE-2026-31834
No data.
ReportizFlow