CVE-2026-24611 Overview
CVE-2026-24611 is an unauthenticated broken access control vulnerability affecting the MetForm Pro WordPress plugin in versions up to and including 3.9.1. The flaw is categorized under [CWE-862] Missing Authorization and allows remote attackers to bypass access control restrictions without authentication. The issue carries a CVSS v3.1 base score of 9.1, reflecting network-based exploitation with no privileges or user interaction required. Successful exploitation can lead to unauthorized access to protected functionality, exposure of sensitive form data, and disruption of plugin operations on affected WordPress sites.
Critical Impact
Unauthenticated attackers can invoke protected MetForm Pro functions over the network, leading to confidentiality compromise and availability impact on WordPress sites running version 3.9.1 or earlier.
Affected Products
- MetForm Pro WordPress plugin versions <= 3.9.1
- WordPress sites with MetForm Pro installed and active
- Web environments exposing the plugin's REST or AJAX endpoints to the public internet
Discovery Timeline
- 2026-06-17 - CVE-2026-24611 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-24611
Vulnerability Analysis
The vulnerability stems from missing authorization checks in MetForm Pro, a premium form-builder plugin for WordPress. One or more plugin endpoints fail to verify whether the requesting user holds the required capability or nonce before executing privileged operations. This classifies the issue as broken access control under [CWE-862] Missing Authorization. Because the endpoint is reachable without authentication, any remote actor can issue crafted HTTP requests to the WordPress site and reach functionality intended for administrators or authenticated users. The Patchstack advisory tracks the issue as a broken access control flaw impacting plugin versions through 3.9.1.
Root Cause
The root cause is the absence of a proper capability or permission callback on plugin handlers. WordPress plugins typically guard sensitive actions with current_user_can() checks, REST API permission_callback functions, or check_ajax_referer() nonces. In MetForm Pro <= 3.9.1, at least one handler omits these controls, allowing unauthenticated invocation of restricted operations.
Attack Vector
Exploitation requires only network access to the target WordPress site. An attacker sends a crafted HTTP request to the vulnerable plugin endpoint, such as a REST route under /wp-json/ or an admin-ajax.php action exposed by MetForm Pro. No credentials, session, or user interaction are needed. Refer to the Patchstack Vulnerability Report for endpoint-level technical details.
Detection Methods for CVE-2026-24611
Indicators of Compromise
- Unauthenticated HTTP requests to MetForm Pro REST routes or admin-ajax.php actions originating from unexpected source IPs
- Unexplained modifications, exports, or reads of form submission data stored by MetForm Pro
- Spikes in POST or GET requests targeting MetForm-related endpoints outside normal site usage patterns
Detection Strategies
- Inspect web server and WordPress access logs for requests to MetForm Pro endpoints lacking authentication cookies or valid nonce parameters
- Deploy WordPress-aware Web Application Firewall (WAF) rules that flag access control bypass patterns against the plugin
- Audit MetForm Pro version on all managed WordPress instances and flag any site running 3.9.1 or earlier
Monitoring Recommendations
- Forward WordPress and web server logs to a centralized SIEM or data lake for correlation across sites
- Alert on anomalous request volume or response sizes from plugin endpoints associated with form data
- Monitor WordPress audit logs for unexpected configuration or form definition changes
How to Mitigate CVE-2026-24611
Immediate Actions Required
- Identify all WordPress installations running MetForm Pro and confirm the installed version
- Upgrade MetForm Pro to a version newer than 3.9.1 once the vendor-supplied fixed release is available
- Restrict access to the WordPress admin and REST API surfaces using IP allow-listing or a WAF where feasible
- Review form submission data for signs of unauthorized access or tampering
Patch Information
Consult the Patchstack Vulnerability Report for the patched version and vendor remediation guidance. Apply the vendor update through the WordPress plugin updater or by deploying the patched plugin package to all affected sites.
Workarounds
- Temporarily deactivate MetForm Pro on exposed sites until the patched version is installed
- Deploy WAF rules that block unauthenticated requests to MetForm Pro REST routes and AJAX actions
- Limit access to /wp-json/ and admin-ajax.php endpoints used by the plugin via server-level access controls
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
