CVE-2026-40723: Bricks Builder Auth Bypass Vulnerability

CVE-2026-40723 Overview

CVE-2026-40723 is a broken access control vulnerability affecting the Bricks Builder WordPress theme in versions up to and including 2.1.4. The flaw allows authenticated users holding the low-privilege Subscriber role to access functionality that should be restricted to higher-privileged accounts. The underlying weakness is classified as CWE-862: Missing Authorization. Exploitation requires only valid subscriber credentials, which are commonly issued by WordPress sites that allow open user registration. Successful exploitation results in limited integrity impact on the affected site.

Critical Impact
Authenticated subscribers can bypass intended access restrictions in Bricks Builder, enabling unauthorized modifications within the WordPress site's integrity boundary.

Affected Products

Bricks Builder WordPress theme versions <= 2.1.4
WordPress installations using the Bricks Builder theme with subscriber-level registration enabled
WordPress sites distributing Bricks Builder through the Patchstack-tracked vulnerability ecosystem

Discovery Timeline

2026-06-17 - CVE-2026-40723 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-40723

Vulnerability Analysis

The vulnerability resides in Bricks Builder, a popular WordPress site-building theme. Versions up to 2.1.4 fail to enforce proper authorization checks on functionality intended for privileged roles. Authenticated users with the lowest standard WordPress role, Subscriber, can invoke actions outside their permission boundary.

The issue maps to CWE-862: Missing Authorization. The application performs authentication checks but omits a corresponding capability or role check before executing sensitive operations. As a result, the server processes subscriber-issued requests as if they originated from an authorized user.

The vulnerability affects integrity only. Confidentiality and availability remain unaffected based on the published CVSS vector. Refer to the Patchstack WordPress Vulnerability Report for vendor-specific endpoint details.

Root Cause

The root cause is a missing authorization check in one or more Bricks Builder action handlers. WordPress themes typically gate privileged actions with current_user_can() capability checks or nonce validations tied to specific roles. The affected handlers in Bricks Builder <= 2.1.4 validate only that a user is logged in, not that the user holds the required capability.

Attack Vector

The attack vector is network-based and requires low privileges. An attacker registers or compromises a subscriber account on a target WordPress site running Bricks Builder. The attacker then issues HTTP requests to the vulnerable handler with valid session cookies or authentication tokens. The server executes the request without verifying role membership, allowing the subscriber to perform actions reserved for editors or administrators. No user interaction is required beyond the attacker's own session.

No verified public proof-of-concept code is available at this time. Consult the Patchstack advisory for technical specifics.

Detection Methods for CVE-2026-40723

Indicators of Compromise

Unexpected content, template, or settings modifications correlated with subscriber-level WordPress accounts
HTTP POST or AJAX requests to Bricks Builder endpoints originating from accounts that should not have editing capabilities
New or recently registered subscriber accounts issuing requests to admin-ajax.php or REST routes tied to Bricks Builder

Detection Strategies

Review WordPress audit logs for actions performed by subscriber-role users that altered theme, page, or template data
Correlate web server access logs with WordPress role assignments to surface privilege mismatches
Inspect Bricks Builder action handlers for invocations not preceded by a capability check

Monitoring Recommendations

Enable a WordPress activity logging plugin to capture role-based action telemetry
Forward web server and WordPress logs to a centralized analytics platform for cross-account correlation
Alert on bulk content changes or template edits initiated by non-administrator accounts

How to Mitigate CVE-2026-40723

Immediate Actions Required

Update the Bricks Builder theme to a version later than 2.1.4 as soon as the vendor releases a fixed build
Audit all WordPress accounts and remove or downgrade unused subscriber accounts
Disable open user registration on production sites that do not require it

Patch Information

A fixed version beyond 2.1.4 should be obtained from the Bricks Builder vendor. Refer to the Patchstack WordPress Vulnerability Report for the latest remediation guidance and patched release information.

Workarounds

Restrict subscriber registration by disabling the Anyone can register option under WordPress general settings
Deploy a Web Application Firewall (WAF) rule to block subscriber-role requests targeting Bricks Builder action endpoints
Apply a virtual patch through a WordPress security plugin such as Patchstack until the official fix is installed

bash

# Disable open registration via WP-CLI as a temporary mitigation
wp option update users_can_register 0

# Audit and list all subscriber accounts for review
wp user list --role=subscriber --fields=ID,user_login,user_registered,user_email