CVE-2026-85037 Overview
The Sunshine Photo Cart WordPress plugin before version 3.7 contains a business logic flaw that allows unauthenticated attackers to purchase items at reduced prices. The plugin fails to validate that a client-supplied price identifier belongs to the item being added to the cart. Attackers can substitute price identifiers from other items on the site and complete orders at those alternate prices. The flaw is classified as [CWE-639] Authorization Bypass Through User-Controlled Key. Exploitation results in financial loss for site owners operating photo commerce storefronts.
Critical Impact
Unauthenticated attackers can complete purchases at arbitrary reduced prices by manipulating client-supplied price identifiers during checkout.
Affected Products
- Sunshine Photo Cart WordPress plugin versions prior to 3.7
- WordPress sites running vulnerable plugin instances
- E-commerce deployments using Sunshine Photo Cart for order processing
Discovery Timeline
- 2026-09-09 - CVE-2026-85037 published to NVD
- 2026-09-09 - Last updated in NVD database
Technical Details for CVE-2026-85037
Vulnerability Analysis
The vulnerability resides in the cart handling logic of the Sunshine Photo Cart plugin. When a user adds an item to the cart, the request includes a price identifier supplied by the client. The plugin accepts this identifier without verifying that it belongs to the specific item being purchased. This allows any price defined elsewhere on the site to be assigned to any item during checkout.
The issue represents a business logic flaw combined with insecure direct object reference behavior. Because the attack requires no authentication, any visitor can exploit it against a vulnerable storefront. The scope of impact is limited to the integrity of order pricing rather than site compromise or data exposure.
Root Cause
The root cause is missing server-side validation of the relationship between an item identifier and its price identifier. The plugin trusts the client to submit the correct price reference. Under [CWE-639], the application uses a user-controlled key to select which price record applies without confirming the key maps to the requested item.
Attack Vector
An unauthenticated attacker browses the target storefront and enumerates price identifiers from any listed item. The attacker then initiates a cart request for a high-value item and substitutes the price identifier of a lower-priced item. The plugin accepts the mismatched identifier and calculates the order total using the substituted price. The attacker completes checkout and receives the target item at the reduced price.
The vulnerability is exploited over the network through standard HTTP requests to the plugin's cart endpoints. No user interaction is required beyond the attacker's own session. Technical details are described in the WPScan Vulnerability Report.
Detection Methods for CVE-2026-85037
Indicators of Compromise
- Completed orders where the recorded price is significantly below the listed price of the purchased item
- Cart or order records containing price identifiers that do not correspond to the associated item in the product catalog
- Unusual patterns of low-value orders originating from the same client IP or session
Detection Strategies
- Audit order history for mismatches between item catalog price and the final transaction price recorded by the plugin
- Compare price identifiers stored in order records against the price identifiers registered for the purchased items
- Review web server logs for repeated cart submissions from the same source that manipulate the price parameter across items
Monitoring Recommendations
- Enable transaction logging on the WordPress site and forward order events to a centralized log store for review
- Configure alerts when order totals fall below a defined percentage of the listed item price
- Monitor Sunshine Photo Cart plugin version across WordPress deployments to identify hosts still running vulnerable releases
How to Mitigate CVE-2026-85037
Immediate Actions Required
- Update the Sunshine Photo Cart WordPress plugin to version 3.7 or later on all affected sites
- Review recent order history for transactions completed at prices inconsistent with catalog pricing
- Refund or reverse fraudulent low-price orders and contact affected buyers where appropriate
Patch Information
The vendor addressed the vulnerability in Sunshine Photo Cart version 3.7. The patched release adds server-side validation that verifies the submitted price identifier belongs to the item being added to the cart. Administrators should apply the update through the WordPress plugin management interface. Additional details are available in the WPScan Vulnerability Report.
Workarounds
- Temporarily disable the Sunshine Photo Cart plugin on sites that cannot be updated immediately
- Restrict access to cart and checkout endpoints using a web application firewall rule that inspects and validates price parameters
- Manually reconcile each completed order against expected catalog pricing before fulfillment until the patched version is deployed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
