CVE-2026-16039: CWE-639 Authorization Bypass Through User-Controlled Key in MStore API
The MStore API WordPress plugin before version 4.21.0 contains an authorization bypass vulnerability in its vendor-orders endpoint. This flaw allows any authenticated user, including those with minimal privileges such as Subscribers, to access all WooCommerce orders and associated customer personal information. The vulnerability arises because the endpoint does not restrict access to only the caller's own orders.
AI Analysis
Technical Summary
CVE-2026-16039 is an authorization bypass vulnerability (CWE-639) in the MStore API WordPress plugin versions prior to 4.21.0. The vendor-orders endpoint fails to enforce proper access controls, enabling any authenticated user to retrieve every WooCommerce order in the store along with sensitive customer data. This issue compromises confidentiality by exposing personal information to unauthorized users. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity level. No official patch or remediation guidance is currently documented.
Potential Impact
Unauthorized authenticated users can read all WooCommerce orders and customer personal information, leading to a breach of confidentiality. There is no indication of impact to integrity or availability. This exposure could result in privacy violations and potential misuse of customer data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the vendor-orders endpoint by limiting authenticated user roles or applying custom access controls to prevent unauthorized data exposure.
CVE-2026-16039: CWE-639 Authorization Bypass Through User-Controlled Key in MStore API
Description
The MStore API WordPress plugin before version 4.21.0 contains an authorization bypass vulnerability in its vendor-orders endpoint. This flaw allows any authenticated user, including those with minimal privileges such as Subscribers, to access all WooCommerce orders and associated customer personal information. The vulnerability arises because the endpoint does not restrict access to only the caller's own orders.
CVSS v3.1
Score 6.5medium
Affected software
MStore API
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-16039 is an authorization bypass vulnerability (CWE-639) in the MStore API WordPress plugin versions prior to 4.21.0. The vendor-orders endpoint fails to enforce proper access controls, enabling any authenticated user to retrieve every WooCommerce order in the store along with sensitive customer data. This issue compromises confidentiality by exposing personal information to unauthorized users. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity level. No official patch or remediation guidance is currently documented.
Potential Impact
Unauthorized authenticated users can read all WooCommerce orders and customer personal information, leading to a breach of confidentiality. There is no indication of impact to integrity or availability. This exposure could result in privacy violations and potential misuse of customer data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the vendor-orders endpoint by limiting authenticated user roles or applying custom access controls to prevent unauthorized data exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-07-17T09:20:57.280Z
- State
- PUBLISHED
Threat ID: 6a757731bf8831d539df5eb0
Added to database: 08/07/2026, 06:12:01 UTC
Last enriched: 08/14/2026, 15:59:13 UTC
Last updated: 09/21/2026, 22:01:32 UTC
Views: 70
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