CVE-2026-92437 Overview
CVE-2026-92437 affects the Mailchimp for WooCommerce WordPress plugin in versions prior to 6.3. The plugin processes abandoned-cart records using identifiers supplied in the request without performing authentication, nonce validation, or ownership checks. An unauthenticated remote attacker can modify or delete abandoned-cart data belonging to other customers by referencing their cart identifier. The weakness is tracked as Missing Authorization [CWE-862].
Critical Impact
Unauthenticated attackers can tamper with or delete any customer's stored abandoned-cart record on affected WooCommerce storefronts, degrading recovery workflows and integrity of customer data.
Affected Products
- Mailchimp for WooCommerce WordPress plugin versions prior to 6.3
- WordPress sites running WooCommerce with the vulnerable plugin enabled
- Storefronts relying on abandoned-cart recovery via Mailchimp integration
Discovery Timeline
- 2026-10-03 - CVE-2026-92437 published to NVD
- 2026-10-06 - Last updated in NVD database
Technical Details for CVE-2026-92437
Vulnerability Analysis
The Mailchimp for WooCommerce plugin exposes functionality that acts on abandoned-cart records stored for customers. The handler accepts a cart identifier from request-supplied data and operates on the matching record without validating the requester. No authentication cookie, capability check, nonce, or ownership verification is enforced before modification or deletion occurs.
Because the plugin trusts the client-supplied identifier, any party able to send HTTP requests to the WordPress site can target records associated with other customers. The impact is limited to integrity of abandoned-cart data; confidentiality and availability of the broader site are not directly affected based on the advisory scope.
Abandoned-cart records support marketing recovery flows. Tampering with or deleting these records disrupts remarketing campaigns, skews conversion metrics, and may remove evidence of customer activity used by downstream automations.
Root Cause
The root cause is a Missing Authorization defect [CWE-862]. The vulnerable code path omits three controls expected for state-changing operations on per-user data: authentication, a WordPress nonce for request intent, and an ownership check binding the cart record to the requesting user or session.
Attack Vector
Exploitation is performed over the network against the WordPress HTTP endpoint exposed by the plugin. The attacker crafts a request supplying a target cart identifier, which the plugin processes without validation. No user interaction and no privileges are required. Enumerating or guessing cart identifiers allows broad targeting of customer records.
See the WPScan Vulnerability Report for additional technical context.
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Stop Identity AttacksDetection Methods for CVE-2026-92437
Indicators of Compromise
- Unauthenticated HTTP requests to Mailchimp for WooCommerce plugin endpoints referencing abandoned-cart identifiers not associated with the requester's session.
- Unexpected deletions or modifications of wp_mailchimp_carts (or equivalent) database rows outside normal customer activity.
- Spikes in anonymous requests to WooCommerce AJAX or REST routes handling cart recovery.
Detection Strategies
- Review WordPress and web server access logs for requests to the plugin's cart endpoints lacking valid session cookies or nonces.
- Alert on high-volume sequential access patterns against abandoned-cart identifiers suggestive of enumeration.
- Compare WooCommerce order/cart telemetry against Mailchimp sync records to identify unexplained drops in abandoned-cart counts.
Monitoring Recommendations
- Enable WordPress audit logging for plugin database operations affecting cart tables.
- Forward web server logs to a centralized analytics or SIEM platform and build detections for anonymous POST traffic to Mailchimp for WooCommerce routes.
- Monitor plugin version inventory across managed WordPress sites to confirm patch state.
How to Mitigate CVE-2026-92437
Immediate Actions Required
- Upgrade the Mailchimp for WooCommerce plugin to version 6.3 or later on all affected WordPress sites.
- Audit abandoned-cart records for unexpected modifications or deletions since the plugin was installed.
- Restrict access to WordPress admin and AJAX endpoints behind a web application firewall where feasible.
Patch Information
The vendor addressed the issue in Mailchimp for WooCommerce version 6.3. The fix introduces authorization validation on the vulnerable cart-handling path. Refer to the WPScan Vulnerability Report for the patched release reference.
Workarounds
- If immediate patching is not possible, disable the Mailchimp for WooCommerce plugin until it can be updated to 6.3.
- Add WAF rules that block unauthenticated requests to the plugin's abandoned-cart endpoints.
- Rate-limit anonymous requests to WordPress AJAX and REST routes used by WooCommerce extensions.
# Example WP-CLI commands to inventory and update the affected plugin
wp plugin get mailchimp-for-woocommerce --field=version
wp plugin update mailchimp-for-woocommerce --version=6.3
wp plugin deactivate mailchimp-for-woocommerce # temporary workaround if update is blocked
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
