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CVE-2026-18234— MStore API < 4.21.1 - Subscriber+ Arbitrary Order Payment Bypass via Wallet

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，在处理钱包支付时未验证目标订单是否属于请求者，并且对于大多数支付方式未从钱包余额中扣除相应金额，这导致任何已认证用户（包括订阅者）都可以将任意订单标记为“已支付”，而无需实际支付任何款项。

AI Predicted 7.2 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-18234

Vulnerability Information
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Vulnerability Title
MStore API < 4.21.1 - Subscriber+ Arbitrary Order Payment Bypass via Wallet
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 its wallet payment handling belongs to the requester, and does not deduct the wallet balance for most payment methods, allowing any authenticated user, including Subscribers, to mark arbitrary orders as paid without any payment being taken.
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-2026-18234

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III. Intelligence Information for CVE-2026-18234

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Other References for CVE-2026-18234 (1)

Same Patch Batch · Unknown · 2026-08-29 · 26 CVEs total

CVE-2026-76586 BookingPress 1.5.6 - 1.6.2 - Unauthenticated Booking Price Manipulation via PayPal Payment
CVE-2026-10522 Simple User Registration <= 6.9 - Unauthenticated Privilege Escalation to Administrator
CVE-2026-16061 Rest Routes <= 5.5.5 - Unauthenticated SQLi via custom-tables/tables/{table_name}
CVE-2026-16947 Total Processing Card Payments for WooCommerce <= 7.3 - Unauthenticated SSRF leading to Pa
CVE-2026-16600 SmartAIPress <= 1.2.0 - Subscriber+ Server-Side Request Forgery via smartaipress_openai_up
CVE-2026-16259 Uix UserCenter <= 1.0.3 - Unauthenticated Privilege Escalation
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
CVE-2026-18233 MStore API < 4.21.1 - Subscriber+ Arbitrary Order Completion
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-2026-81026 MasterStudy LMS < 3.7.40 - Unauthenticated Payment Bypass via PayPal IPN
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-2026-77007 HEL Online Classroom: AI-powered Online Classrooms <= 1.0.3 - Unauthenticated BigBlueButto
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

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MStore API
Same vendor: Unknown

V. Comments for CVE-2026-18234

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