CVE-2026-16038— MStore API < 4.21.0 - Unauthenticated Payment Bypass via Multiple Payment Gateways
Quick assessment
Affected
Unknown MStore API
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 MStore API WordPress 插件 4.21.0 版本之前，其在多个支付完成端点上未在与支付网关验证付款之前就标记订单为已支付状态。这使得未经身份验证的攻击者可以无需实际付款就将任意订单标记为全额已支付，从而免费获取商品或服务。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Unknown | MStore API | < 4.21.0 |
affected |
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I. Basic Information for CVE-2026-16038
Vulnerability Information
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Vulnerability Title
MStore API < 4.21.0 - Unauthenticated Payment Bypass via Multiple Payment Gateways
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Unknown | MStore API | 0 ~ 4.21.0 | - |
|
II. Public POCs for CVE-2026-16038
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-16038 (1)
-
🔗 MStore API < 4.21.0 – Unauthenticated Payment Bypass via Multiple Payment Gateways | CVE 2026-16038 | Plugin Vulnerabilities Read full article exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-08-07 · 21 CVEs total
| CVE-2026-15211 | 5.9 MEDIUM | Subscriptions for WooCommerce < 2.0.1 - Payment Bypass via Attacker-Supplied PayPal Captur |
| CVE-2026-15148 | 5.3 MEDIUM | WP Events Manager < 2.2.5 - Unauthenticated Payment Bypass and Booking Status Update via I |
| CVE-2026-15239 | 5.3 MEDIUM | Simple CAPTCHA with Cloudflare Turnstile < 1.42.0 - Unauthenticated Turnstile Protection B |
| CVE-2026-14205 | WP Events Manager < 2.2.5 - Subscriber+ Payment Bypass via 'qty' Parameter | |
| CVE-2026-14943 | Password Protected < 2.8.4 - Unauthenticated Sensitive Information Exposure via REST API | |
| CVE-2026-14331 | Subscribe2 < 10.46 - Reflected XSS via email Parameter | |
| CVE-2026-15032 | wpDiscuz < 7.6.60 - Unauthenticated Stored XSS via Image URL Conversion | |
| CVE-2026-15215 | Subscriptions for WooCommerce < 2.0.1 - Shop Manager+ Arbitrary Plugin Installation | |
| CVE-2026-15214 | Subscriptions for WooCommerce < 2.0.1 - Subscriber+ Subscription Detail Disclosure via IDO | |
| CVE-2026-15359 | Templately < 3.7.1 - Unauthenticated Administrator Templately Cloud Connection Overwrite | |
| CVE-2026-15245 | BNE Testimonials < 2.0.8.2 - Contributor+ Stored XSS via Slider Shortcode | |
| CVE-2026-16030 | MStore API < 4.21.0 - Unauthenticated Account Takeover via Firebase Phone Authentication | |
| CVE-2026-16039 | MStore API < 4.21.0 - Subscriber+ Order and Customer PII Disclosure via IDOR | |
| CVE-2026-15361 | Content Views < 4.5 - Subscriber+ SQL Injection via preview_request | |
| CVE-2026-15386 | Meow Gallery < 5.5.2 - Author+ Stored XSS via Attachment Alt-Text | |
| CVE-2026-16262 | Estatik < 4.3.3 - Login CSRF | |
| CVE-2026-16041 | MStore API < 4.21.0 - Unauthenticated Product Review Creation | |
| CVE-2026-16263 | WP Maps < 4.9.7 - Subscriber+ Local File Inclusion | |
| CVE-2026-16265 | WP Maps < 4.9.7 - Subscriber+ Denial of Service | |
| CVE-2026-16258 | Ajax Search Lite < 4.14.5 - Unauthenticated PHP Object Injection via Search Statistics RES |
IV. Related Vulnerabilities
Same product: MStore API
-
CVE-2026-97219
MStore API 4.21.1 - 4.22.0 - Subscriber+ Payment Bypass via -
CVE-2026-18234
MStore API < 4.21.1 - Subscriber+ Arbitrary Order Payment By -
CVE-2026-18233
MStore API < 4.21.1 - Subscriber+ Arbitrary Order Completion -
CVE-2026-27543
WordPress MStore API plugin <= 4.20.0 - Privilege Escalation -
CVE-2026-16041
MStore API < 4.21.0 - Unauthenticated Product Review Creatio
Same vendor: Unknown
-
CVE-2026-94238
Loco Translate < 2.8.9 - Translator+ Limited File Read via ' -
CVE-2026-94239
Loco Translate < 2.8.9 - Translator+ Stored XSS via Bundle C -
CVE-2026-92923
Unlimited Elements For Elementor 1.5.142 - 2.0.20 - Subscrib -
CVE-2026-96962
Pie Register < 3.8.4.14 - Unauthenticated User Email Disclos -
CVE-2026-89236
SaveTo Wishlist Lite < 1.1.5 - Unauthenticated SQLi via 'sor
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