CVE-2026-7859 Overview
CVE-2026-7859 affects the Motors WordPress plugin in versions prior to 1.4.110. The plugin exposes an AJAX action without proper authorization or Cross-Site Request Forgery (CSRF) checks. Unauthenticated attackers can invoke this endpoint over the network to modify arbitrary post metadata. Affected metadata includes the gallery, the featured image, and, on sites running WooCommerce, product prices. The flaw maps to CWE-862: Missing Authorization and stems from the plugin trusting AJAX callers without verifying capability or nonce values.
Critical Impact
Unauthenticated remote attackers can alter product prices, swap featured images, and rewrite post metadata on vulnerable WordPress and WooCommerce sites.
Affected Products
- Motors WordPress plugin versions prior to 1.4.110
- WordPress sites running the vulnerable Motors plugin
- WooCommerce stores using Motors for product listings
Discovery Timeline
- 2026-06-22 - CVE-2026-7859 published to NVD
- 2026-06-22 - Last updated in NVD database
Technical Details for CVE-2026-7859
Vulnerability Analysis
The Motors plugin registers an AJAX action handler that processes post metadata updates. The handler omits both a current_user_can() capability check and a check_ajax_referer() nonce validation. As a result, any visitor — including unauthenticated users — can send a crafted POST request to wp-admin/admin-ajax.php and update post metadata fields. The handler accepts attacker-controlled post IDs and meta values, allowing modification of records the caller should not own. On WooCommerce-enabled sites, this exposes the _price, _regular_price, and _sale_price meta keys, which control product pricing.
Root Cause
The root cause is missing authorization on a privileged AJAX endpoint [CWE-862]. The action is registered through wp_ajax_nopriv_ hooks, which expose it to unauthenticated requests. The handler then writes directly to wp_postmeta through update_post_meta() without confirming the requester has permission to edit the target post.
Attack Vector
Attacks require only network access to the WordPress site. An attacker sends an HTTP POST request to the vulnerable AJAX endpoint with parameters identifying the target post and the metadata key-value pair to overwrite. No authentication, user interaction, or elevated privileges are required. The attack can be scripted at scale across WooCommerce storefronts to manipulate product prices or replace product imagery with attacker-supplied content.
The vulnerability is described in the WPScan Vulnerability Database. No public proof-of-concept exploit has been published at the time of writing.
Detection Methods for CVE-2026-7859
Indicators of Compromise
- Unexpected changes to WooCommerce product prices, especially _price and _regular_price meta values
- Unauthorized modifications to featured images or post galleries with no corresponding admin login
- POST requests to wp-admin/admin-ajax.php from unauthenticated sources targeting Motors plugin AJAX actions
- Anomalous spikes in update_post_meta() activity in WordPress debug or database query logs
Detection Strategies
- Audit WooCommerce product price history and compare against expected values from order records
- Inspect web server logs for POST requests to admin-ajax.php carrying Motors plugin action names from anonymous sessions
- Enable WordPress activity logging plugins to record post metadata changes with timestamps and source IP
Monitoring Recommendations
- Forward web server access logs and WordPress audit logs to a centralized data lake for correlation
- Alert on bulk post metadata changes occurring outside business hours or without an authenticated admin session
- Monitor outbound referrals from product pages for unexpected images or links indicating gallery tampering
How to Mitigate CVE-2026-7859
Immediate Actions Required
- Update the Motors WordPress plugin to version 1.4.110 or later on all affected sites
- Review WooCommerce product prices and post galleries for unauthorized changes since the plugin was installed
- Restore tampered metadata from known-good backups where modifications are confirmed
Patch Information
The Motors plugin maintainer released version 1.4.110, which adds the missing authorization and CSRF checks to the vulnerable AJAX action. Administrators should upgrade through the WordPress plugin dashboard or by replacing the plugin files manually. See the WPScan advisory for fix confirmation.
Workarounds
- Restrict access to wp-admin/admin-ajax.php from untrusted networks using a web application firewall rule
- Temporarily deactivate the Motors plugin until the patched version can be deployed
- Block POST requests targeting the vulnerable Motors AJAX action name at the edge proxy or CDN layer
# Example WP-CLI command to update the Motors plugin
wp plugin update motors --version=1.4.110
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
