CVE-2026-18233— MStore API < 4.21.1 - Subscriber+ Arbitrary Order Completion
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.
MStore API WordPress 插件在 4.21.1 版本之前，未验证其配送端点所指向的订单是否属于请求者，使得任意已认证用户（包括订阅者）都能将任意订单标记为“已完成”和“已支付”，而实际上并未发生任何支付。
Possible ATT&CK Techniques 1 AI
T1210 · Exploitation of Remote ServicesAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Unknown | MStore API | < 4.21.1 |
affected |
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I. Basic Information for CVE-2026-18233
Vulnerability Information
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Vulnerability Title
MStore API < 4.21.1 - Subscriber+ Arbitrary Order Completion
Source: CVE Program / CVE List V5
Vulnerability Description
The MStore API WordPress plugin before 4.21.1 does not verify that the order targeted by one of its delivery endpoints belongs to the requester, allowing any authenticated user, including Subscribers, to mark arbitrary orders as completed and paid without any payment being made.
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 ~ 4.21.1 | - |
|
II. Public POCs for CVE-2026-18233
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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News Coverage for CVE-2026-18233 (1)
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🔗 MStore API < 4.21.1 – Subscriber+ Arbitrary Order Completion | CVE 2026-18233 | Plugin Vulnerabilities Read full article exploit vdb-entry technical-description
Same Patch Batch · Unknown · 2026-08-29 · 26 CVEs total
| CVE-2026-77007 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated BigBlueButto | |
| CVE-2026-81200 | MasterStudy LMS < 3.7.42 - Instructor+ Cross-Tenant Order Billing PII Disclosure via IDOR | |
| CVE-2026-81342 | MasterStudy LMS < 3.7.43 - Unauthenticated Open Redirect | |
| CVE-2026-81346 | Frontend Admin by DynamiApps < 3.29.11 - Subscriber+ Arbitrary Membership Plan Deletion | |
| CVE-2026-81026 | MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN | |
| CVE-2026-80311 | Stripe Payment Forms by WP Full Pay < 8.5.5 - Cross-Customer Subscription Cancellation via | |
| CVE-2026-80488 | WP Ultimate CSV Importer < 9.0 - Admin+ SQLi via AIOSEO Import Fields | |
| CVE-2026-77704 | Amelia 1.2.32 - 2.4.8 - Amelia Customer+ Appointment Status Update and Self-Approval | |
| CVE-2026-77786 | Rank Math SEO < 1.0.277 - Editor+ Core Settings Modification via fix-site-seo Ability | |
| CVE-2026-76586 | BookingPress 1.5.6 - 1.6.2 - Unauthenticated Booking Price Manipulation via PayPal Payment | |
| CVE-2026-77010 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated Moderator Jo | |
| CVE-2026-77012 | Icollect <= 1.0.0 - Unauthenticated Arbitrary File Read, SSRF and Path Traversal File Writ | |
| CVE-2026-77008 | HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated Plugin Setti | |
| CVE-2026-16259 | Uix UserCenter <= 1.0.3 - Unauthenticated Privilege Escalation | |
| CVE-2026-76547 | Profile Builder < 4.0.1 - Admin+ PHP Object Injection via Import/Export | |
| CVE-2026-76548 | Profile Builder < 4.0.1 - Unauthenticated Unpublished Content and Media Modification via F | |
| CVE-2026-17520 | Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key | |
| CVE-2026-17522 | Newsletters < 4.17 - Arbitrary Plugin Option Update via CSRF | |
| CVE-2026-76546 | Profile Builder < 4.0.1 - Contributor+ Stored XSS via Format Date Shortcode | |
| CVE-2026-19430 | CatFolders Document Gallery Pro < 2.0.7 - Unauthenticated Missing Authorization via downlo |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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CVE-2026-16039
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V. Comments for CVE-2026-18233
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