CVE-2026-7559: Affilia WordPress Auth Bypass Vulnerability

CVE-2026-7559 Overview

CVE-2026-7559 is a missing authorization vulnerability [CWE-862] in the Affilia – Affiliate Program & Referral Tracking for WordPress plugin. All versions up to and including 3.3.3 are affected. The plugin fails to verify user authorization before executing sensitive operations. Authenticated attackers with subscriber-level access can approve or reject affiliate referrals, credit commissions to affiliate wallets, delete referral records, and modify custom banner plugin options. The single nonce protecting these actions, rtwalwm_global_params.rtwalwm_nonce, is exposed in every frontend page load, rendering the check ineffective.

Critical Impact
Any authenticated WordPress user, including low-privilege subscribers, can commit financial fraud by manipulating affiliate commissions and referral records.

Affected Products

Affilia – Affiliate Program & Referral Tracking for WordPress plugin, versions up to and including 3.3.3
WordPress installations with the affiliaa-affiliate-program-with-mlm plugin enabled
Sites using the plugin's affiliate wallet and referral tracking features

Discovery Timeline

2026-07-11 - CVE-2026-7559 published to NVD
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-7559

Vulnerability Analysis

The Affilia plugin exposes multiple AJAX action handlers responsible for administrative affiliate operations. These handlers include referral approval and rejection, wallet crediting, referral deletion, and custom banner option management. The handlers rely solely on a WordPress nonce for request validation and skip capability checks such as current_user_can().

The nonce rtwalwm_nonce is emitted to every frontend page inside the global JavaScript object rtwalwm_global_params. Any logged-in visitor, including subscribers, can read this nonce from page source. Once obtained, the attacker replays it in AJAX POST requests to trigger privileged actions. The result is a broken access control condition that transforms subscriber accounts into de facto affiliate program administrators.

Root Cause

The root cause is missing authorization enforcement in the plugin's admin action handlers, located in admin/rtwalwm-class-wp-wc-affiliate-program-admin.php at lines 660, 742, 812, and 837. The developers treated nonce verification as sufficient authentication. Nonces protect against Cross-Site Request Forgery but do not establish role-based authorization. Because the nonce is globally distributed via public/rtwalwm-class-wp-wc-affiliate-program-public.php line 127, it cannot serve as a trust boundary between user roles.

Attack Vector

An attacker registers a subscriber account or compromises any authenticated session. They load any frontend page and extract rtwalwm_global_params.rtwalwm_nonce from the JavaScript context. The attacker then submits crafted AJAX POST requests to admin-ajax.php targeting the vulnerable actions, supplying arbitrary referral IDs, wallet amounts, or banner configuration values. The plugin executes each request without verifying the caller's role, enabling direct financial fraud against the affiliate program.

No verified exploit code is publicly available. See the Wordfence Vulnerability Report and the WordPress Changeset Review for the code paths and remediation diff.

Detection Methods for CVE-2026-7559

Indicators of Compromise

Unexpected changes in affiliate referral status (approved or rejected) that do not correlate with administrator activity.
Unexplained wallet balance credits to affiliate accounts, particularly to accounts recently registered as subscribers.
Missing or deleted referral records in the plugin's database tables.
Modified custom banner plugin options without a corresponding administrator session.

Detection Strategies

Monitor wp-admin/admin-ajax.php requests originating from subscriber-level accounts targeting rtwalwm_* actions.
Correlate WordPress user role with the AJAX actions invoked and alert on privilege mismatches.
Audit plugin database tables for referral status transitions and wallet credit events that lack a matching administrator audit log entry.

Monitoring Recommendations

Enable WordPress security plugin logging for all AJAX actions prefixed with rtwalwm_.
Track HTTP referrer and user role fields in web server access logs for POST requests to admin-ajax.php.
Alert on abnormal frequencies of referral approval or wallet credit operations from non-administrator sessions.

How to Mitigate CVE-2026-7559

Immediate Actions Required

Update the Affilia – Affiliate Program & Referral Tracking for WordPress plugin to a version above 3.3.3 as soon as a patched release is available.
Restrict new subscriber account registration on affected sites until the plugin is updated.
Review recent affiliate referral approvals, wallet credits, and banner option changes for unauthorized activity.

Patch Information

Refer to the WordPress Changeset Review for the vendor's remediation. Confirm the installed plugin version is later than 3.3.3 and that capability checks such as current_user_can() are present in the previously vulnerable handlers. The Wordfence Vulnerability Report tracks the fixed version.

Workarounds

Deactivate the Affilia plugin until an updated version is deployed if patching is not immediately possible.
Use a web application firewall to block POST requests to admin-ajax.php with action values matching the vulnerable rtwalwm_* handlers when originating from non-administrator sessions.
Disable open subscriber registration to reduce the pool of accounts capable of exploiting the flaw.

bash

# Example WordPress CLI check for installed plugin version
wp plugin get affiliaa-affiliate-program-with-mlm --field=version

# Temporarily deactivate the plugin until patched
wp plugin deactivate affiliaa-affiliate-program-with-mlm