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    CVE-2026-16038

    The MStore API WordPress plugin before 4.21.0 does not verify the payment with the payment gateway before marking an order as paid on several of its payment-completion endpoints, allowing an unauthenticated attacker to mark an arbitrary order fully paid without paying and obtain goods or services for free.

    Published:Aug 7, 2026
    Last Modified:Aug 8, 2026
    EPS:Aug 7, 2026
    EPSS Score:0.0024
    CVSS Score:9.1

    Affected Products

    Vendor
    Mstore
    Product
    Mstore Api
    Vendor
    Wordpress
    Product
    Wordpress

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-104 Cross Zone Scripting
    CAPEC-127 Directory Indexing
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-17 Using Malicious Files
    CAPEC-39 Manipulating Opaque Client-based Data Tokens
    CAPEC-402 Bypassing ATA Password Security
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-5 Blue Boxing
    CAPEC-50 Password Recovery Exploitation
    CAPEC-51 Poison Web Service Registry
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-647 Collect Data from Registries
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-77 Manipulating User-Controlled Variables
    CAPEC-87 Forceful Browsing

    Related CVEs

    CVE-2026-18234 (CVSS 6.5) — The MStore API WordPress plugin before 4.21.1 does not verify that the order targeted by its wallet payment h…
    CVE-2026-18233 (CVSS 6.5) — The MStore API WordPress plugin before 4.21.1 does not verify that the order targeted by one of its delivery …
    CVE-2026-16041 (CVSS 7.5) — The MStore API WordPress plugin before 4.21.0 does not perform authorization or purchase-ownership checks on …
    CVE-2026-16039 (CVSS 6.5) — The MStore API WordPress plugin before 4.21.0 does not restrict its vendor-orders endpoint to the caller's ow…
    CVE-2026-16030 (CVSS 8.1) — The MStore API WordPress plugin before 4.21.0 does not correctly verify the cryptographic signature of the to…
    CVE-2021-47933 (CVSS 9.3) — WordPress MStore API 2.0.6 contains an arbitrary file upload vulnerability that allows unauthenticated attacke…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High