CVE-2026-101926: Hyyan WooCommerce Polylang SQL Injection

CVE-2026-101926 Overview

CVE-2026-101926 is a SQL Injection vulnerability [CWE-89] in the Hyyan WooCommerce Polylang Integration plugin for WordPress. The flaw exists in the variation_ids parameter of the woocommerce_remove_variations AJAX action and affects all versions up to and including 1.5.0. Insufficient escaping of user-supplied input combined with a lack of query preparation allows authenticated attackers with Subscriber-level access or above to append arbitrary SQL to existing queries. Successful exploitation lets attackers extract sensitive data from the WordPress database, including user credentials, session tokens, and private store information.

Critical Impact
Authenticated attackers with minimal privileges can inject SQL statements to exfiltrate confidential data from the WordPress database.

Affected Products

Hyyan WooCommerce Polylang Integration plugin for WordPress
All plugin versions up to and including 1.5.0
WordPress sites running WooCommerce with the vulnerable plugin enabled

Discovery Timeline

2026-10-14 - CVE-2026-101926 published to NVD
2026-10-14 - Last updated in NVD database

Technical Details for CVE-2026-101926

Vulnerability Analysis

The vulnerability resides in the woocommerce_remove_variations AJAX handler implemented in the plugin's Variable.php and Variation.php source files. The handler accepts a variation_ids parameter directly from the HTTP request and interpolates it into a SQL statement without proper sanitization or use of parameterized queries. Because the plugin registers the AJAX endpoint for logged-in users without strict capability checks, any authenticated user including Subscribers can reach the vulnerable code path. Attackers can append UNION SELECT or stacked clauses that return rows from arbitrary tables, enabling disclosure of password hashes, user metadata, API keys, and other secrets stored in WordPress tables.

Root Cause

The root cause is the use of unsanitized user input inside a raw SQL query. The plugin fails to apply $wpdb->prepare() with placeholder tokens and does not cast or whitelist the variation_ids array elements as integers before concatenating them into the query. See the WordPress plugin source at Variable.php line 280 and the related code in Variation.php line 146 for the vulnerable patterns.

Attack Vector

Exploitation requires network access to the WordPress site and a valid account with Subscriber privileges or higher. The attacker sends a crafted POST request to /wp-admin/admin-ajax.php with action=woocommerce_remove_variations and a malicious variation_ids payload. The injected SQL executes with the privileges of the WordPress database user, which typically holds full read access to all WordPress tables. No user interaction from an administrator is required.

// Example exploitation code (sanitized)
// No verified proof-of-concept code is available for CVE-2026-101926.
// Refer to the Wordfence advisory and plugin source references for
// technical details on the vulnerable AJAX handler and parameter flow.

Detection Methods for CVE-2026-101926

Indicators of Compromise

POST requests to /wp-admin/admin-ajax.php containing action=woocommerce_remove_variations with suspicious variation_ids values such as UNION, SELECT, SLEEP, or encoded SQL metacharacters.
Unexpected database query errors in WordPress or PHP logs referencing the woo-poly-integration plugin files.
Low-privilege Subscriber accounts suddenly issuing high volumes of AJAX requests to WooCommerce endpoints.

Detection Strategies

Review web server access logs for requests to admin-ajax.php that include the woocommerce_remove_variations action from non-administrative accounts.
Enable MySQL general query logging temporarily to identify malformed or injected queries originating from the plugin.
Deploy a WordPress security plugin or WAF rule that inspects AJAX parameters for SQL injection payload signatures.

Monitoring Recommendations

Alert on authentication events from Subscriber-tier accounts followed by AJAX requests to WooCommerce administrative actions.
Track outbound data volumes from the web server for signs of bulk data exfiltration.
Monitor WordPress user table changes and new administrative account creation, which can follow credential extraction.

How to Mitigate CVE-2026-101926

Immediate Actions Required

Disable or deactivate the Hyyan WooCommerce Polylang Integration plugin until a patched release is installed.
Audit all WordPress accounts and remove unused Subscriber or higher-privilege users.
Force password rotation for all WordPress users and invalidate active sessions, assuming hashes may have been exfiltrated.
Review the Wordfence vulnerability report for the latest remediation guidance.

Patch Information

At the time of publication, no fixed version has been identified in the NVD entry for CVE-2026-101926. Administrators should monitor the plugin's official WordPress.org page for an update beyond version 1.5.0 and apply it as soon as it becomes available.

Workarounds

Restrict access to /wp-admin/admin-ajax.php from untrusted networks using IP allowlisting at the web server or WAF layer.
Deploy virtual patching rules in a web application firewall to block requests where variation_ids contains non-numeric characters.
Require strong registration controls and disable open user registration to limit the pool of attackers eligible to reach the vulnerable endpoint.
Enforce least-privilege database credentials for WordPress so the application account cannot read unrelated schemas.

bash

# Configuration example
# Example ModSecurity-style WAF rule to block non-numeric variation_ids values
SecRule ARGS:action "@streq woocommerce_remove_variations" \
    "id:1026101926,phase:2,chain,deny,status:403,\
    msg:'Possible CVE-2026-101926 SQLi attempt'"
    SecRule ARGS:variation_ids "@rx [^0-9,]" "t:none"