CVE-2026-28190: ProLancer Element Auth Bypass Vulnerability

CVE-2026-28190 Overview

CVE-2026-28190 is a broken access control vulnerability in the ProLancer Element WordPress plugin affecting versions up to and including 1.4.8. The flaw allows authenticated users at the Subscriber role level to perform actions that should be restricted to higher-privileged roles. The weakness is categorized under CWE-862: Missing Authorization. Attackers exploiting this issue can compromise integrity and cause limited availability impact without needing to bypass user interaction or elevated privileges beyond a basic authenticated account.

Critical Impact
A low-privileged Subscriber account can invoke plugin functions lacking proper authorization checks, enabling unauthorized modifications to site data and partial disruption of service.

Affected Products

ProLancer Element WordPress plugin, versions <= 1.4.8
WordPress installations with the vulnerable plugin activated
Sites permitting Subscriber-level registration

Discovery Timeline

2026-08-24 - CVE-2026-28190 published to the National Vulnerability Database (NVD)
2026-08-24 - Last updated in NVD database

Technical Details for CVE-2026-28190

Vulnerability Analysis

The vulnerability stems from missing authorization checks within one or more request handlers exposed by the ProLancer Element plugin. WordPress plugins typically expose actions through admin-ajax.php, REST routes, or admin post handlers. When these handlers omit current_user_can() capability checks or fail to validate the user's role, any authenticated session can trigger sensitive functionality.

In this case, Subscriber accounts, which normally have read-only capabilities, can reach endpoints that should require Editor or Administrator privileges. The attack requires network access and a valid low-privileged account but no user interaction. The primary impact is on data integrity, with a secondary impact on availability, while confidentiality is unaffected according to the published metrics.

Refer to the Patchstack Vulnerability Report for vendor-provided technical details.

Root Cause

The root cause is a missing authorization check [CWE-862] on one or more plugin actions. The handler either omits a capability verification entirely or relies on a nonce alone. Nonces confirm request intent but do not authorize a role, so any logged-in user with the nonce reaches privileged code paths.

Attack Vector

An attacker registers or obtains a Subscriber account on a WordPress site running ProLancer Element <= 1.4.8. The attacker then issues authenticated requests to the affected plugin endpoint, supplying parameters that trigger the unauthorized action. Because the attack vector is network-based with low complexity, exploitation can be automated across many targets.

See the Patchstack Vulnerability Report for exploitation specifics. No public proof-of-concept exploit is currently available.

Detection Methods for CVE-2026-28190

Indicators of Compromise

Unexpected POST requests from Subscriber-level accounts to wp-admin/admin-ajax.php referencing ProLancer Element actions
Content, options, or plugin settings modified by users whose role is Subscriber
New Subscriber account registrations followed shortly by administrative-style activity in WordPress logs

Detection Strategies

Inspect web server access logs for authenticated requests to plugin endpoints originating from low-privileged user sessions
Audit the WordPress wp_usermeta and wp_options tables for changes not attributable to administrators
Enable WordPress activity logging plugins to correlate user role with action performed

Monitoring Recommendations

Alert on Subscriber accounts triggering AJAX or REST actions associated with ProLancer Element
Monitor for spikes in new user registrations followed by plugin-related HTTP traffic
Baseline the normal role-to-endpoint mapping and flag deviations for review

How to Mitigate CVE-2026-28190

Immediate Actions Required

Update ProLancer Element to a version later than 1.4.8 once the vendor publishes a fixed release
Disable the ProLancer Element plugin until a patched version is applied if updates are unavailable
Audit existing Subscriber accounts and remove any that were created without a legitimate business reason
Temporarily disable open user registration under Settings → General → Membership

Patch Information

At the time of publication, no fixed version has been listed in the NVD entry for CVE-2026-28190. Consult the Patchstack Vulnerability Report and the plugin's changelog on the WordPress plugin directory for release announcements. Apply the vendor-supplied update as soon as it becomes available.

Workarounds

Deploy a Web Application Firewall (WAF) rule blocking unauthenticated and Subscriber-role requests to ProLancer Element AJAX and REST endpoints
Restrict access to wp-admin/admin-ajax.php for non-administrator sessions where feasible
Enforce strong registration controls, including CAPTCHA and email verification, to limit automated Subscriber account creation
Remove the plugin entirely if it is not business-critical

bash

# Example: temporarily deactivate the plugin via WP-CLI
wp plugin deactivate prolancer-element

# Verify current installed version
wp plugin get prolancer-element --field=version

# Disable open user registration
wp option update users_can_register 0