CVE-2026-12936 Overview
CVE-2026-12936 is a SQL Injection vulnerability in the Recurio – Ultimate Subscription for WooCommerce plugin for WordPress. The flaw affects all plugin versions up to and including 1.1.3. The vulnerability stems from insufficient escaping of the user-supplied data parameter combined with inadequate preparation of the underlying SQL query [CWE-89]. Authenticated attackers with shop manager privileges or higher can append arbitrary SQL clauses to existing queries. Successful exploitation allows extraction of sensitive information from the WordPress database, including customer records, session tokens, and administrative metadata.
Critical Impact
Authenticated shop managers can execute arbitrary SQL statements against the WordPress database, exposing confidential subscription and customer data.
Affected Products
- Recurio – Ultimate Subscription for WooCommerce plugin for WordPress
- All versions up to and including 1.1.3
- WordPress sites running WooCommerce with the Recurio plugin enabled
Discovery Timeline
- 2026-07-08 - CVE-2026-12936 published to NVD
- 2026-07-08 - Last updated in NVD database
Technical Details for CVE-2026-12936
Vulnerability Analysis
The vulnerability resides in the Recurio subscription engine, specifically in code paths within class-subscription-engine.php that construct SQL statements using the data parameter. The plugin fails to properly escape user-supplied input and does not use prepared statements with parameter binding. Attackers with shop manager access or higher can inject additional SQL syntax into the query context. The injected clauses execute with the same database privileges as the WordPress application user. This enables extraction of arbitrary rows from any table accessible to the WordPress database user, including wp_users, wp_usermeta, and WooCommerce order tables containing personal and payment metadata.
Root Cause
The root cause is a failure to sanitize input passed through the data parameter before concatenation into an SQL query. The affected code, referenced around lines 301 and 1095 of includes/core/class-subscription-engine.php, does not use $wpdb->prepare() with placeholder syntax. Instead, user input is inserted directly into the query string, breaking the boundary between code and data. Review of the plugin source is available in the WordPress Plugin File Reference.
Attack Vector
Exploitation requires an authenticated session with shop manager privileges or above. The attacker submits a crafted data parameter to the vulnerable plugin endpoint over HTTP or HTTPS. Because the query is not parameterized, the attacker can terminate the intended query and append UNION SELECT statements or subqueries. No user interaction beyond the attacker's own authenticated request is required. The vulnerability does not permit unauthenticated exploitation, which limits the attacker population but does not eliminate risk from compromised staff accounts or insider threats.
No public proof-of-concept code is available. Technical detail on the vulnerable code path is provided in the Wordfence Vulnerability Report.
Detection Methods for CVE-2026-12936
Indicators of Compromise
- HTTP requests to Recurio plugin endpoints containing SQL syntax such as UNION, SELECT, --, or /* inside the data parameter.
- WordPress database queries in mysql logs referencing wp_users or wp_usermeta originating from the plugin context.
- Unexpected outbound data transfers from the WordPress host shortly after shop manager authentication events.
- Presence of Recurio plugin at version 1.1.3 or earlier in the WordPress plugin directory.
Detection Strategies
- Enable WordPress query logging and inspect statements originating from the Recurio subscription engine for unusual clauses.
- Deploy a web application firewall rule that inspects the data parameter on plugin AJAX and REST endpoints for SQL metacharacters.
- Correlate shop manager authentication events with anomalous database query volume or query duration.
Monitoring Recommendations
- Alert on any modification to class-subscription-engine.php outside of a planned plugin update window.
- Monitor WooCommerce role assignments and audit accounts holding shop_manager capability.
- Track HTTP 500 responses and database errors from Recurio endpoints, which often accompany injection attempts.
How to Mitigate CVE-2026-12936
Immediate Actions Required
- Update the Recurio – Ultimate Subscription for WooCommerce plugin to a version later than 1.1.3 once the vendor publishes a fixed release.
- Audit all accounts assigned the shop_manager role and remove unnecessary elevated privileges.
- Rotate WordPress administrator and shop manager passwords if any suspicious query activity is observed.
- Review WooCommerce order and customer data for evidence of unauthorized access.
Patch Information
A fix is tracked in the plugin repository. Refer to the WordPress Changeset Overview for the code changes that address the injection point. Site administrators should install the patched release through the WordPress plugin update mechanism as soon as it is available.
Workarounds
- Deactivate the Recurio plugin until a patched version is installed, if subscription functionality is not business-critical.
- Restrict access to the WordPress admin interface to trusted source IP addresses using web server or firewall rules.
- Enforce multi-factor authentication for all users with shop_manager or higher privileges to reduce the risk of credential compromise.
- Deploy WAF signatures that block SQL metacharacters in the data parameter on Recurio endpoints.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
