CVE-2026-57730: Flatsome Auth Bypass Vulnerability

CVE-2026-57730 Overview

CVE-2026-57730 is a broken access control vulnerability affecting the Flatsome WordPress theme in versions up to and including 3.20.5. The flaw allows authenticated users with Subscriber-level privileges to access functionality that should be restricted to higher-privileged roles. The issue is tracked under [CWE-862] Missing Authorization.

The vulnerability requires low-privilege authentication but no user interaction. Exploitation can lead to unauthorized access to protected theme functionality on affected WordPress sites. The confidentiality impact is limited, and there is no direct impact on integrity or availability.

Critical Impact
Authenticated Subscriber accounts can bypass authorization checks in the Flatsome theme, exposing functionality intended for privileged users on WordPress installations.

Affected Products

Flatsome WordPress theme versions <= 3.20.5
WordPress installations using the Flatsome theme
Sites permitting Subscriber-level user registration on affected Flatsome versions

Discovery Timeline

2026-07-02 - CVE-2026-57730 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57730

Vulnerability Analysis

The vulnerability stems from missing authorization checks in the Flatsome theme. Attackers with Subscriber-level accounts can invoke theme functionality that should be gated by capability checks. WordPress Subscribers are the lowest privileged authenticated role and typically cannot modify site content or configuration.

Broken access control weaknesses of this type occur when a server-side handler validates authentication but fails to validate authorization for the requested action. The Flatsome theme handler processes requests from any logged-in user without confirming the caller has the required capability. This gives Subscribers access to features intended for Editors, Administrators, or the theme's internal workflows.

WordPress sites that allow open registration are exposed by default, since attackers can create Subscriber accounts and then invoke the affected functionality. The impact is scoped to confidentiality; no integrity or availability effects were reported.

Root Cause

The root cause is a missing current_user_can() capability check or equivalent authorization guard on a Flatsome theme endpoint. The code path relies on authentication alone rather than validating the caller's role against the operation being performed, which is the classic pattern behind [CWE-862].

Attack Vector

Exploitation requires a valid Subscriber account on the target WordPress site. The attacker sends a crafted authenticated HTTP request to the vulnerable Flatsome endpoint over the network. See the Patchstack Flatsome Theme Vulnerability advisory for technical details on the affected endpoint.

No verified public exploit code is available for CVE-2026-57730. No exploitation in the wild has been confirmed, and the CVE is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-57730

Indicators of Compromise

Unexpected authenticated HTTP requests from Subscriber-role accounts targeting Flatsome theme endpoints under /wp-admin/admin-ajax.php or theme-specific action handlers
Spikes in new Subscriber account registrations followed by requests to theme AJAX or REST routes
WordPress audit log entries showing Subscribers invoking actions normally reserved for Editor or Administrator roles

Detection Strategies

Inspect WordPress access logs for authenticated requests to Flatsome theme handlers originating from low-privilege sessions
Deploy a WordPress security plugin or Web Application Firewall (WAF) rule that flags Subscribers issuing privileged theme actions
Correlate user role information with request patterns to identify authorization mismatches

Monitoring Recommendations

Enable WordPress activity logging with role and capability context for every action
Alert on registration of Subscriber accounts followed by immediate calls to admin-ajax.php or theme-specific endpoints
Track the installed Flatsome theme version across WordPress inventory and flag any host still running <= 3.20.5

How to Mitigate CVE-2026-57730

Immediate Actions Required

Update the Flatsome theme to a version later than 3.20.5 as soon as the vendor patch is available
Audit existing Subscriber accounts and remove any that appear anomalous or unused
Disable open user registration if it is not required for site operation

Patch Information

Refer to the Patchstack Flatsome Theme Vulnerability advisory for the fixed version and patch details. Apply the vendor-supplied update via the WordPress admin dashboard or by replacing the theme files with the patched release.

Workarounds

Restrict user registration by setting Anyone can register to disabled under WordPress General Settings
Deploy a virtual patch through a WordPress WAF or Patchstack rule that blocks Subscriber-role access to the vulnerable Flatsome endpoint
Limit Subscriber capabilities using a role management plugin until the patched theme version is installed

bash

# Configuration example: disable open registration via wp-cli
wp option update users_can_register 0

# Verify installed Flatsome theme version
wp theme get flatsome --field=version