CVE-2026-16038: CWE-862 Missing Authorization in MStore API
The MStore API WordPress plugin before version 4.21.0 contains a missing authorization vulnerability in its payment-completion endpoints. This flaw allows unauthenticated attackers to mark arbitrary orders as paid without verifying payment with the payment gateway, potentially enabling free acquisition of goods or services.
AI Analysis
Technical Summary
CVE-2026-16038 is a missing authorization vulnerability (CWE-862) in the MStore API WordPress plugin versions prior to 4.21.0. The plugin fails to verify payment status with the payment gateway before marking orders as paid on several payment-completion endpoints. This allows unauthenticated attackers to arbitrarily mark orders as fully paid without completing actual payment, leading to unauthorized access to goods or services.
Potential Impact
An attacker can bypass payment verification and mark orders as paid without authorization, resulting in financial loss due to fraudulent free acquisition of goods or services. The vulnerability has a CVSS score of 9.1 (critical), indicating high impact on confidentiality and integrity, but no impact on availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to payment-completion endpoints and monitor for suspicious activity related to order status changes.
CVE-2026-16038: CWE-862 Missing Authorization in MStore API
Description
The MStore API WordPress plugin before version 4.21.0 contains a missing authorization vulnerability in its payment-completion endpoints. This flaw allows unauthenticated attackers to mark arbitrary orders as paid without verifying payment with the payment gateway, potentially enabling free acquisition of goods or services.
CVSS v3.1
Score 9.1critical
Affected software
MStore API
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-16038 is a missing authorization vulnerability (CWE-862) in the MStore API WordPress plugin versions prior to 4.21.0. The plugin fails to verify payment status with the payment gateway before marking orders as paid on several payment-completion endpoints. This allows unauthenticated attackers to arbitrarily mark orders as fully paid without completing actual payment, leading to unauthorized access to goods or services.
Potential Impact
An attacker can bypass payment verification and mark orders as paid without authorization, resulting in financial loss due to fraudulent free acquisition of goods or services. The vulnerability has a CVSS score of 9.1 (critical), indicating high impact on confidentiality and integrity, but no impact on availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to payment-completion endpoints and monitor for suspicious activity related to order status changes.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-07-17T09:20:54.757Z
- State
- PUBLISHED
Threat ID: 6a757731bf8831d539df5ead
Added to database: 08/07/2026, 06:12:01 UTC
Last enriched: 08/14/2026, 15:56:28 UTC
Last updated: 09/21/2026, 22:01:32 UTC
Views: 61
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