Is this vulnerability remotely exploitable?

It is not exploitable by anonymous users. Exploitation requires access to the Umbraco backoffice with a valid account that has user-management capabilities, but once that access exists, an attacker may use the weakness to gain much higher privileges.

What level of access does an attacker need to exploit this?

The attacker must control an authenticated backoffice account with permissions to manage users or modify user group memberships. This could be their own legitimate account or a compromised account belonging to a delegated administrator or staff member.

What is the safest general fix pattern for this kind of issue?

The safest pattern is to implement strict, centralized authorization checks for all user and role management operations, based on a clear hierarchy: a user must not be able to assign privileges higher than their own or modify groups outside their designated scope. All role assignments should be validated server-side against this model, regardless of client input.

Severity:

HIGH RISK

(7.2)

Privilege Escalation via Improper Authorization (CWE-269) in Umbraco CMS User Group Management

CVE-2026-31834

Published:

Mar 10, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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HIGH RISK

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Improper Authorization / Privilege Escalation

CWE:

CWE-269;CWE-284;CWE-862

Impact:

Privilege Escalation to Higher-Privileged Roles

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Authorization / Privilege Escalation

CWE:

CWE-269;CWE-284;CWE-862

Impact:

Privilege Escalation to Higher-Privileged Roles

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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Privilege Escalation via Improper Authorization (CWE-269) in Umbraco CMS User Group Management

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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