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CVE-2026-31834

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CVE-2026-31834

Published: Mar 10, 2026

Modified: Mar 11, 2026

PUBLISHED

CVSS v3.1

7.2

HIGH

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.

VendorProductVersions

umbraco

Umbraco-CMS

affected
>= 15.3.1, < 16.5.1
affected
>= 17.0.0, < 17.2.1

Weaknesses (CWE)

CWE-269
CWE-284
CWE-862

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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