CVE-2026-62136 Overview
CVE-2026-62136 is a broken access control vulnerability affecting the Flexible Quantity – Measurement Price Calculator for WooCommerce plugin in versions up to and including 2.3.21. The flaw allows unauthenticated attackers to reach functionality that should require authorization, enabling limited modification of plugin-managed data over the network. The weakness is classified under [CWE-862: Missing Authorization]. No user interaction or privileges are required to trigger the issue, and the attack originates remotely against WooCommerce storefronts running the affected plugin.
Critical Impact
Unauthenticated remote attackers can invoke protected plugin actions on WooCommerce sites, resulting in limited integrity impact against product pricing or measurement calculator configuration.
Affected Products
- Flexible Quantity – Measurement Price Calculator for WooCommerce plugin, versions <= 2.3.21
- WordPress sites running WooCommerce with the affected plugin installed
- E-commerce storefronts exposing the plugin's endpoints to the public internet
Discovery Timeline
- 2026-09-11 - CVE-2026-62136 published to the National Vulnerability Database (NVD)
- 2026-09-11 - Last updated in NVD database
Technical Details for CVE-2026-62136
Vulnerability Analysis
The vulnerability originates from missing authorization checks in the Flexible Quantity – Measurement Price Calculator for WooCommerce plugin. One or more plugin actions execute without validating whether the caller has the required capability or authenticated session. Attackers reach these actions directly over HTTP without providing credentials or user interaction.
The scope of the issue maps to [CWE-862: Missing Authorization]. Impact is limited to integrity, meaning attackers can alter data exposed by the vulnerable endpoints but cannot directly read confidential information or crash the site. In WooCommerce contexts, such tampering typically affects product measurement configuration, pricing calculator parameters, or associated plugin settings that influence checkout math.
An attacker exploiting this weakness can undermine store pricing integrity, disrupt commerce workflows, or stage further attacks against downstream buyers. Consult the Patchstack Vulnerability Report for endpoint-level detail.
Root Cause
The plugin exposes actions that lack capability checks such as current_user_can() and lack nonce verification via check_ajax_referer() or equivalent. Because WordPress plugins that rely on admin-ajax.php or REST routes must implement their own authorization, omitting these checks leaves the handlers reachable by any unauthenticated visitor.
Attack Vector
Attackers deliver crafted HTTP requests to the plugin's exposed action endpoints on a vulnerable WooCommerce site. No authentication, elevated privileges, or user interaction are required. The request invokes the protected functionality directly, modifying plugin-controlled state.
The vulnerability manifests in the plugin's action handlers where authorization is not enforced. See the Patchstack advisory for endpoint identifiers and payload structure.
Detection Methods for CVE-2026-62136
Indicators of Compromise
- Unauthenticated POST or GET requests to plugin action endpoints under /wp-admin/admin-ajax.php referencing measurement price calculator actions
- Unexpected modifications to product measurement configuration or pricing calculator settings without a corresponding administrator login
- WooCommerce order anomalies where item totals diverge from the store's documented pricing model
Detection Strategies
- Review WordPress access logs for requests to plugin endpoints originating from IPs that never authenticated to /wp-login.php
- Enable WordPress action logging or an audit plugin to capture writes to plugin settings and product metadata
- Alert on plugin configuration changes made outside of expected administrator maintenance windows
Monitoring Recommendations
- Forward web server and WordPress audit logs to a centralized logging platform for correlation with authentication events
- Baseline normal request volumes to plugin endpoints and alert on sudden spikes from single sources
- Monitor product catalog and pricing tables for out-of-band changes and reconcile against administrator activity
How to Mitigate CVE-2026-62136
Immediate Actions Required
- Identify all WordPress sites running Flexible Quantity – Measurement Price Calculator for WooCommerce at version 2.3.21 or earlier
- Deactivate the plugin on affected sites until a patched release is verified and deployed
- Restrict access to /wp-admin/admin-ajax.php from untrusted networks where feasible using a web application firewall
Patch Information
At the time of NVD publication on 2026-09-11, the advisory identifies affected versions as <= 2.3.21. Review the Patchstack Vulnerability Report and the plugin vendor's changelog for the fixed release, and upgrade as soon as a patched version is published.
Workarounds
- Apply virtual patching rules through a WAF to block unauthenticated requests to the vulnerable plugin actions
- Limit access to WordPress administrative endpoints by IP allowlisting where operationally feasible
- Reconcile product pricing and measurement configuration against a known-good backup and restore any tampered values
# Configuration example: temporarily disable the vulnerable plugin via WP-CLI
wp plugin deactivate flexible-quantity-measurement-price-calculator-for-woocommerce
wp plugin status flexible-quantity-measurement-price-calculator-for-woocommerce
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
