CVE-2026-32552: YITH WooCommerce Membership SQL Injection

CVE-2026-32552 Overview

CVE-2026-32552 is a SQL injection vulnerability affecting YITH WooCommerce Membership Premium plugin versions up to and including 2.33.0. The flaw allows authenticated users with subscriber-level privileges to inject arbitrary SQL commands into database queries. This weakness maps to [CWE-89], improper neutralization of special elements used in an SQL command.

The vulnerability carries network-based exploitability and requires only low-privileged authentication. Successful exploitation can expose confidential data stored in the WordPress database, including customer records and membership information tied to WooCommerce transactions.

Critical Impact
Authenticated subscriber accounts can execute arbitrary SQL queries against the WordPress database, leading to disclosure of sensitive membership and customer data across affected WooCommerce sites.

Affected Products

YITH WooCommerce Membership Premium plugin versions <= 2.33.0
WordPress sites running the vulnerable plugin with WooCommerce
Membership-based e-commerce deployments that allow subscriber registration

Discovery Timeline

2026-08-19 - CVE-2026-32552 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-32552

Vulnerability Analysis

The vulnerability resides in the YITH WooCommerce Membership Premium plugin, a commercial extension that manages subscription-based access to WooCommerce content. Input supplied by authenticated subscribers reaches SQL query construction without proper sanitization or parameterization.

The attack scope is classified as changed, meaning the exploit affects resources beyond the vulnerable component itself. This typically indicates that injection into the WordPress database can pivot to data belonging to other plugins, users, or WooCommerce orders. Confidentiality impact is high, while integrity is not directly affected and availability impact remains limited.

Any user role that can register on the site, including the default subscriber role, can trigger the flaw. This lowers the exploitation barrier substantially compared to admin-only SQL injection issues. Consult the Patchstack Vulnerability Advisory for the specific vulnerable parameter details.

Root Cause

The root cause is improper neutralization of user-supplied input concatenated into SQL statements. The plugin fails to use prepared statements or apply the WordPress $wpdb->prepare() API when handling parameters from subscriber-level requests. This allows attacker-controlled strings to alter the intended query logic.

Attack Vector

An attacker registers a subscriber account on a target WordPress site running the vulnerable plugin. The attacker then submits crafted HTTP requests containing malicious SQL fragments to the affected plugin endpoint. The backend executes the tampered query, returning sensitive data or exposing rows the subscriber should not access.

Code examples are not published for this issue. See the Patchstack advisory for further technical context.

Detection Methods for CVE-2026-32552

Indicators of Compromise

Unexpected SQL syntax such as UNION SELECT, SLEEP(, INFORMATION_SCHEMA, or comment sequences -- in query strings or POST bodies targeting YITH plugin endpoints
Subscriber-role accounts issuing repeated requests to membership-related URLs shortly after registration
Web server error logs showing MySQL syntax errors originating from plugin PHP files

Detection Strategies

Deploy web application firewall rules that inspect authenticated request parameters for SQL metacharacters and known injection payloads
Enable WordPress database query logging and alert on queries containing unusual UNION, SLEEP, or nested SELECT constructs from plugin contexts
Correlate new subscriber registrations with immediate access to membership plugin endpoints as a behavioral indicator

Monitoring Recommendations

Monitor authentication logs for spikes in new subscriber registrations followed by anomalous plugin traffic
Track outbound data volumes from the WordPress host to detect bulk exfiltration through blind or union-based injection
Review WooCommerce audit trails for unauthorized access to customer, order, or membership records

How to Mitigate CVE-2026-32552

Immediate Actions Required

Update YITH WooCommerce Membership Premium to a version above 2.33.0 as soon as the vendor publishes a patched release
Restrict new user registration on affected sites until the plugin is updated, or set the default role to prevent subscriber creation
Audit existing subscriber accounts and remove any that appear unfamiliar or automated

Patch Information

Refer to the Patchstack Vulnerability Advisory for the fixed version and vendor guidance. Apply the vendor-supplied update through the WordPress plugin manager or by replacing the plugin files directly.

Workarounds

Disable the YITH WooCommerce Membership Premium plugin until an updated release is installed
Deploy a virtual patching rule at the web application firewall to block SQL injection patterns on plugin endpoints
Enforce least-privilege database credentials for the WordPress user to limit the blast radius of any successful injection

bash

# Example WP-CLI command to disable the vulnerable plugin
wp plugin deactivate yith-woocommerce-membership-premium