CVE-2026-9842
Received Received - Intake

Privilege Escalation in Backstage Customizer Demo Access WordPress Plugin

Publication date: 2026-07-08

Last updated on: 2026-07-08

Assigner: Wordfence

Description
The Backstage - Customizer Demo Access plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.4.2. This is due to the plugin assigning the `manage_options` capability to the `backstage_customizer_user` demo role, which is more permissive than necessary for Customizer-only demo access. This makes it possible for unauthenticated attackers to navigate beyond the Customizer and update arbitrary WordPress options such as `default_role`, leading to privilege escalation.

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Meta Information

Published
2026-07-08
Last Modified
2026-07-08
Generated
2026-07-08
AI Q&A
2026-07-08
EPSS Evaluated
N/A
NVD
CVE-2026-9842
EUVD
EUVD-2026-42160

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
backstage customizer_demo_access to 1.4.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

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Executive Summary

The Backstage - Customizer Demo Access plugin for WordPress has a vulnerability that allows privilege escalation. This happens because the plugin assigns the 'manage_options' capability to a demo user role called 'backstage_customizer_user', which is more permissive than necessary. As a result, unauthenticated attackers can go beyond the intended Customizer access and update arbitrary WordPress options.

Specifically, attackers can change options like 'default_role', which can lead to gaining higher privileges within the WordPress site.

Impact Analysis

This vulnerability can allow unauthenticated attackers to escalate their privileges on a WordPress site using the affected plugin. By exploiting it, attackers can modify critical site options, potentially gaining administrative control or altering user roles.

Such unauthorized access can lead to site defacement, data manipulation, or further compromise of the website's security.

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