CVE-2026-31887 is an authorization bypass vulnerability in the Shopware open commerce platform core, identified as CWE-863 (Incorrect Authorization). The issue affects Shopware versions >= 6.7.0.0 and < 6.7.8.1, as well as versions prior to 6.6.10.15. The vulnerability arises from insufficient validation of filter types applied to unauthenticated customers when accessing the store-api.order endpoint, particularly involving the deepLinkCode feature. This flaw allows attackers to retrieve order information belonging to other customers without authentication or user interaction. The vulnerability is remotely exploitable over the network with low attack complexity and no privileges required. The CVSS v4.0 score of 8.9 reflects the high impact on confidentiality, as unauthorized access to sensitive order data can lead to privacy violations and potential downstream attacks such as fraud or identity theft. The vulnerability does not affect integrity or availability. Shopware has fixed the issue in versions 6.7.8.1 and 6.6.10.15 by implementing proper authorization checks to ensure that only authorized users can access their respective order data. No public exploits have been reported yet, but the nature of the flaw makes it a critical concern for e-commerce platforms relying on Shopware.

The primary impact of CVE-2026-31887 is the unauthorized disclosure of customer order information, which can include personal data, purchase history, and potentially sensitive transactional details. This breach of confidentiality can erode customer trust, lead to regulatory compliance violations (such as GDPR), and expose organizations to legal liabilities. Attackers could leverage stolen order data for targeted phishing, social engineering, or financial fraud. Since the vulnerability requires no authentication and can be exploited remotely, it significantly increases the attack surface for malicious actors. Organizations running affected Shopware versions risk large-scale data leakage, especially if their e-commerce platforms handle high volumes of transactions. Although the vulnerability does not directly affect system integrity or availability, the reputational damage and potential financial losses from data breaches can be substantial.

Organizations should immediately upgrade Shopware core to versions 6.7.8.1 or 6.6.10.15 or later, where the vulnerability is patched. If immediate upgrading is not feasible, implement strict network-level access controls to restrict access to the store-api.order endpoint, limiting it to authenticated and authorized users only. Conduct thorough audits of API access logs to detect any anomalous or unauthorized requests targeting order data. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious requests exploiting deepLinkCode parameters. Additionally, review and enhance authorization logic in custom Shopware extensions or integrations to prevent similar flaws. Regularly monitor threat intelligence feeds for any emerging exploits related to this CVE. Finally, ensure compliance with data protection regulations by promptly notifying affected customers and authorities in case of data exposure.