CVE-2026-57731 Overview
CVE-2026-57731 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 at the Contributor role level to access functionality that should be restricted to higher-privileged accounts. The issue is tracked under [CWE-862] (Missing Authorization).
The vulnerability requires low privileges and no user interaction, and it can be exploited over the network. Exploitation impacts confidentiality by exposing data that Contributor-level accounts should not be able to reach.
Critical Impact
Authenticated Contributor accounts can bypass authorization checks in the Flatsome theme and access restricted functionality, resulting in unauthorized data exposure on affected WordPress sites.
Affected Products
- Flatsome WordPress theme versions <= 3.20.5
- WordPress installations using the vulnerable Flatsome theme
- Multi-author WordPress sites permitting Contributor-role registrations
Discovery Timeline
- 2026-07-02 - CVE-2026-57731 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-57731
Vulnerability Analysis
CVE-2026-57731 stems from missing authorization checks in the Flatsome theme's request handlers. The theme exposes actions that fail to verify whether the calling user holds the required capability before executing privileged operations. As a result, any authenticated user assigned the Contributor role, an intentionally low-privilege WordPress role, can invoke functionality reserved for editors or administrators.
The classification under [CWE-862] indicates the affected endpoints check that a user is logged in but do not enforce role-based capability checks such as current_user_can(). This authorization gap is common in WordPress themes that route AJAX or admin-post handlers through hooks like wp_ajax_* without dedicated permission validation.
The vulnerability affects confidentiality but does not directly modify integrity or availability, according to the CVSS vector. Contributor-role users on multi-author sites, blogs accepting guest submissions, and e-commerce sites using the Flatsome theme are the primary risk population.
Root Cause
The root cause is missing capability enforcement on theme-defined actions in Flatsome versions up to 3.20.5. Handlers accept requests from any authenticated session without validating whether the user's role authorizes the requested operation. Technical details are available in the Patchstack Vulnerability Report.
Attack Vector
An attacker needs a valid WordPress account with at least Contributor privileges on the target site. After authenticating, the attacker issues HTTP requests to the vulnerable Flatsome endpoints. Because no capability check is performed, the server processes the request and returns data the Contributor account should not be able to view. No social engineering or user interaction is required.
Refer to the Patchstack Vulnerability Report for endpoint-level details.
Detection Methods for CVE-2026-57731
Indicators of Compromise
- Unexpected requests to Flatsome theme AJAX endpoints (/wp-admin/admin-ajax.php) originating from Contributor-role accounts.
- Access log entries showing Contributor accounts retrieving data typically returned only to Editor or Administrator sessions.
- Newly registered low-privilege accounts making rapid or scripted requests to theme-specific actions.
Detection Strategies
- Correlate authenticated session role with the WordPress action being invoked, and alert when Contributor accounts trigger theme actions normally used by higher-privileged roles.
- Monitor for HTTP 200 responses to admin-ajax.php where the request parameters match known Flatsome action names and the session user is not an Administrator or Editor.
- Baseline typical Contributor activity, then flag deviations such as bursts of admin-ajax calls or access to unusual actions.
Monitoring Recommendations
- Enable WordPress audit logging that records the action name, user ID, and role for every privileged request.
- Forward WordPress and web server access logs to a centralized SIEM for role-versus-action correlation.
- Review Contributor account creation events and disable self-registration where it is not required.
How to Mitigate CVE-2026-57731
Immediate Actions Required
- Update the Flatsome theme to a version later than 3.20.5 as soon as the vendor releases a fixed release.
- Audit all Contributor and higher-privilege accounts on WordPress sites running Flatsome and remove unused accounts.
- Restrict new user registrations or require administrator approval until patching is complete.
Patch Information
At the time of publication, users should consult the Patchstack Vulnerability Report for the latest patched version. Apply the update through the WordPress theme updater or by replacing theme files with the vendor-supplied fixed release.
Workarounds
- Temporarily downgrade Contributor accounts to Subscriber where publishing is not immediately required.
- Use a WordPress security plugin or web application firewall to block requests to Flatsome AJAX actions from non-administrator sessions.
- Disable open user registration in Settings > General and set the default role to Subscriber to shrink the pool of accounts that could exploit the flaw.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
