CVE-2026-16038

Status: DeferredCritical (9.1)—

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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Base score: 9.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.42%
Percentile among all scored CVEs: 34
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access85 %
Primary impactT1565.003 Runtime Data Manipulationimpact80 %

CVE-2026-16038: Vector AV:N/PR:N/UI:N indica exposición web sin autenticación. Endpoint de completación de pago sin validación permite manipular órdenes (T1565.003). Obtención de bienes sin pago implica acceso fraudulento a cuenta/servicio (T1078).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Network Segmentation Vulnerability Scanning Restrict File and Directory Permissions Privileged Account Management Limit Access to Resource Over Network Filter Network Traffic

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Inspireui — Mstore API^AI

CWEs

CWE-862

References

https://wpscan.com/vulnerability/6321d247-39c7-43a6-a528-202e1118a5d5/

Raw JSON (NVD)

Show

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          "options": [
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            },
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            },
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          "version": "2.0.3",
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "contact@wpscan.com",
      "affectedData": [
        {
          "vendor": "Unknown",
          "product": "MStore API",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "4.21.0",
              "versionType": "semver"
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  "published": "2026-08-07T06:16:55.950",
  "references": [
    {
      "url": "https://wpscan.com/vulnerability/6321d247-39c7-43a6-a528-202e1118a5d5/",
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    }
  ],
  "lastModified": "2026-08-26T16:31:16.753",
  "sourceIdentifier": "contact@wpscan.com"
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