CVE-2026-31887: Shopware Auth Bypass Vulnerability

CVE-2026-31887 Overview

CVE-2026-31887 is an authorization bypass vulnerability in Shopware, an open commerce platform. The vulnerability exists due to an insufficient check on filter types for unauthenticated customers, which allows unauthorized access to orders belonging to other customers. This issue is part of the deepLinkCode support functionality on the store-api.order endpoint.

Critical Impact

Unauthenticated attackers can access sensitive order information of other customers, potentially exposing personal data, payment details, and transaction history.

Affected Products

• Shopware versions prior to 6.7.8.1
• Shopware versions prior to 6.6.10.15

Discovery Timeline

• 2026-03-11 - CVE-2026-31887 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2026-31887

Vulnerability Analysis

This authorization bypass vulnerability (CWE-863: Incorrect Authorization) affects the Shopware e-commerce platform's Store API. The root cause lies in inadequate validation of filter parameters when processing order retrieval requests through the store-api.order endpoint.

The deepLinkCode functionality is designed to allow customers to access their orders through unique links without requiring full authentication. However, the implementation fails to properly verify that the requesting user has authorization to view the requested order data, enabling attackers to enumerate and access orders belonging to other customers.

Root Cause

The vulnerability stems from insufficient authorization checks on the filter types accepted by the store-api.order endpoint. When processing requests involving deepLinkCode parameters, the application does not adequately validate that the authenticated (or unauthenticated) user has the proper permissions to access the requested order data. This allows manipulation of filter parameters to bypass intended access controls and retrieve orders that should be restricted to other users.

Attack Vector

An attacker can exploit this vulnerability over the network without authentication. By crafting malicious requests to the store-api.order endpoint with manipulated filter parameters, an attacker can bypass the intended authorization controls associated with deepLinkCode validation. The attack requires no user interaction and can be performed remotely against any vulnerable Shopware installation.

The vulnerability mechanism involves manipulating the filter type parameters in API requests to the order endpoint. By exploiting the insufficient validation in the deepLinkCode support functionality, attackers can access order data without proper authorization. For technical details, see the GitHub Security Advisory.

Detection Methods for CVE-2026-31887

Indicators of Compromise

• Unusual patterns of requests to the store-api.order endpoint from single IP addresses
• High volume of order API requests with varying filter parameters from unauthenticated sessions
• Access log entries showing enumeration-style sequential or randomized order ID queries
• Failed authentication attempts followed by successful order data retrieval

Detection Strategies

• Implement rate limiting and anomaly detection on the store-api.order endpoint
• Monitor API access logs for unusual request patterns targeting order endpoints
• Configure web application firewall (WAF) rules to detect filter manipulation attempts
• Enable detailed logging for all order API endpoint access, especially from unauthenticated sources

Monitoring Recommendations

• Set up alerts for high-volume requests to order-related API endpoints
• Monitor for access to multiple distinct order records from single sessions or IP addresses
• Review authentication logs for correlation with order API access patterns
• Implement real-time monitoring for unusual deepLinkCode parameter usage

How to Mitigate CVE-2026-31887

Immediate Actions Required

• Upgrade Shopware immediately to version 6.7.8.1 or later for the 6.7.x branch
• Upgrade Shopware immediately to version 6.6.10.15 or later for the 6.6.x branch
• Review access logs for any signs of exploitation prior to patching
• Conduct a security audit of order data that may have been accessed

Patch Information

Shopware has released security patches addressing this vulnerability. The fix is included in versions 6.7.8.1 and 6.6.10.15. Users should update to these versions or later to remediate the vulnerability. Additional details are available in the GitHub Security Advisory.

Workarounds

• Implement additional access controls at the web server or reverse proxy level to restrict access to the store-api.order endpoint
• Configure WAF rules to block suspicious filter manipulation attempts
• Consider temporarily disabling deepLinkCode functionality if not business-critical until patches can be applied
• Implement IP-based rate limiting on order API endpoints to limit potential data exposure

# Example: Rate limiting configuration for Nginx
# Add to server or location block for order API
location /store-api/order {
    limit_req zone=order_api burst=5 nodelay;
    limit_req_status 429;
    # Continue with proxy_pass or other directives
}