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CVE-2026-83537— WP Express Checkout < 2.5.0 - Unauthenticated Payment Bypass via wpec_process_empty_payment

Quick assessment

Affected
Unknown WP Express Checkout
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.

WP Express Checkout WordPress 插件在 2.5.0 版本之前，在将订单标记为已支付前，未在服务端验证付款是否真正完成，从而允许未认证用户在不实际付款的情况下伪造一个“已完成”的订单。

CVSS 5.3 · Medium EPSS 0.11% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown WP Express Checkout < 2.5.0 affected
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I. Basic Information for CVE-2026-83537

Vulnerability Information
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Vulnerability Title
WP Express Checkout < 2.5.0 - Unauthenticated Payment Bypass via wpec_process_empty_payment
Source: CVE Program / CVE List V5
Vulnerability Description
The WP Express Checkout WordPress plugin before 2.5.0 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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 WP Express Checkout 0 ~ 2.5.0 -

II. Public POCs for CVE-2026-83537

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III. Intelligence Information for CVE-2026-83537

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Other References for CVE-2026-83537 (1)

Same Patch Batch · Unknown · 2026-09-09 · 28 CVEs total

CVE-2026-19855 6.5 MEDIUM Spam protection, Honeypot, Anti-Spam by CleanTalk < 6.87 - Unauthenticated Arbitrary Short
CVE-2026-85117 6.5 MEDIUM Contact Form 7 Captcha 0.1.7 - 0.1.8 - Unauthenticated Arbitrary Shortcode Execution via F
CVE-2026-80440 4.8 MEDIUM Hustle < 7.8.14.2 - Unauthenticated Arbitrary Shortcode Execution via Success Message Plac
CVE-2025-15690 Content Mask 1.7.1 - 1.8.5.5 - Contributor+ Stored XSS via Post Scripts and Styles
CVE-2026-13144 WP Travel < 12.0.2 - Unauthenticated Arbitrary Booking Payment Reset
CVE-2026-13146 WP Travel < 12.0.2 - Unauthenticated Booking Payment State Tampering via IDOR
CVE-2026-14962 ELEX WooCommerce Request a Quote < 2.4.1 - Unauthenticated SQLi via variation_id
CVE-2026-18042 WP Travel < 12.0.2 - Unauthenticated Arbitrary Booking Cancellation
CVE-2026-16960 Loops & Logic < 4.3.0 - Unauthenticated User Data and Site Option Disclosure
CVE-2026-75861 Ultimate Gift Cards for WooCommerce < 3.2.10 - Subscriber+ Gift Card Theft and Destruction
CVE-2026-80339 Payment Plugins for Stripe WooCommerce < 4.0.12 - Unauthenticated Customer PII Disclosure
CVE-2026-80340 Payment Plugins for PayPal WooCommerce < 2.0.26 - Unauthenticated Customer PII Disclosure
CVE-2026-80341 Payment Plugins for PayPal WooCommerce < 2.0.26 - Subscriber+ Stored Payment Method Assign
CVE-2026-81021 SupportCandy 3.2.9 - 3.5.2 - Unauthenticated Ticket Attachment Disclosure
CVE-2026-81741 Groundhogg < 4.7.2 - Open Redirect via 'redirect_to' Parameter
CVE-2026-81022 SupportCandy 3.3.6 - 3.5.2 - Unauthenticated Ticket Content Disclosure via Auth Code Leak
CVE-2026-82185 WPLP Cookie Consent < 4.4.2 - Subscriber+ Banner Settings Overwrite and A/B Test Data Rese
CVE-2026-82848 Masteriyo LMS 1.3.1 - 2.3.3 - Unauthenticated Course Enrollment Disclosure
CVE-2026-82184 WPLP Cookie Consent < 4.4.2 - Unauthenticated IAB TCF Consent Option Update
CVE-2026-84113 Quentn WP < 1.2.15 - Admin+ SQLi via 'orderby'/'order' Parameter

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: WP Express Checkout
Same vendor: Unknown

V. Comments for CVE-2026-83537

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