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CVE-2026-16621— Payment Gateway for PayPal on WooCommerce < 9.2.1 - Unauthenticated Payment Bypass via PayPal Advanced Return Handler

Quick assessment

Affected
Unknown Payment Gateway for PayPal on WooCommerce
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.

WordPress Payment Gateway for PayPal on WooCommerce是WordPress基金会开源的一款在线支付处理插件。 WordPress Payment Gateway for PayPal on WooCommerce 9.2.1之前版本存在输入验证错误漏洞，该漏洞源于在PayPal返回处理程序中未验证支付是否实际成功，可能导致未经身份验证的攻击者将任意订单标记为已支付而无需付款。

CVSS 5.3 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Payment Gateway for PayPal on WooCommerce < 9.2.1 affected
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I. Basic Information for CVE-2026-16621

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Payment Gateway for PayPal on WooCommerce < 9.2.1 - Unauthenticated Payment Bypass via PayPal Advanced Return Handler
Source: CVE Program / CVE List V5
Vulnerability Description
The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid 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
Vulnerability Title
WordPress Payment Gateway for PayPal on WooCommerce 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Payment Gateway for PayPal on WooCommerce是WordPress基金会开源的一款在线支付处理插件。 WordPress Payment Gateway for PayPal on WooCommerce 9.2.1之前版本存在输入验证错误漏洞，该漏洞源于在PayPal返回处理程序中未验证支付是否实际成功，可能导致未经身份验证的攻击者将任意订单标记为已支付而无需付款。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Payment Gateway for PayPal on WooCommerce 0 ~ 9.2.1 -

II. Public POCs for CVE-2026-16621

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III. Intelligence Information for CVE-2026-16621

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Vendor Advisories for CVE-2026-16621 (1)

Same Patch Batch · Unknown · 2026-08-12 · 44 CVEs total

CVE-2026-16747 6.5 MEDIUM Kirki < 6.2.1 - Unauthenticated Arbitrary Shortcode Execution via Form Email Actions
CVE-2026-15045 6.5 MEDIUM Wallet System for WooCommerce < 2.7.10 - Customer+ Checkout Price Manipulation via Unvalid
CVE-2026-17008 5.3 MEDIUM Quick PayPal Payments <= 5.7.50 - Unauthenticated Payment Bypass via PayPal IPN
CVE-2026-16990 5.3 MEDIUM Payment Button for PayPal <= 1.2.3.44 - Unauthenticated Payment Price Manipulation
CVE-2026-15213 5.3 MEDIUM Welcart e-Commerce < 2.11.33 - Unauthenticated Payment Bypass via Forged Settlement Callba
CVE-2026-18044 3.7 LOW Estatik Real Estate Plugin < 4.3.4 - Unauthenticated Arbitrary-Recipient Mail Relay via Si
CVE-2026-18789 Ezoic < 2.23.1 - Unauthenticated Database Export via Content Export REST Routes
CVE-2026-17013 WP Photo Album Plus < 9.2.07.002 - Reflected XSS via lbstart
CVE-2026-18962 WP Photo Album Plus < 9.2.09.002 - Subscriber+ Cross-Album File Upload via Missing Authori
CVE-2026-19052 ProSolution WP Client < 2.0.9 - Subscriber+ proSol_ajaxTablesync and proSol_ajaxClearlog C
CVE-2026-19073 Order Sync with Zendesk for WooCommerce < 2.2.3 - Unauthenticated Customer Order Data Disc
CVE-2026-19217 Royal Elementor Addons < 1.7.1065 - Contributor+ Stored XSS via Icon Box Widget
CVE-2026-19050 ProSolution WP Client < 2.0.9 - Subscriber+ SSRF via proSol_url_validate
CVE-2026-18057 Events Manager < 7.4.1 - Subscriber+ Booking Consent Record Tampering via SQL Injection
CVE-2026-18049 WP Photo Album Plus < 9.2.07.002 - Unauthenticated Option Disclosure via gettogo
CVE-2026-18366 Events Manager < 7.4.1 - Unauthenticated Privilege Escalation to Administrator
CVE-2026-18230 WP Directory Kit < 1.5.6 - Subscriber+ SQL Injection via section Parameter
CVE-2026-18391 WooCommerce Subscriptions < 9.1.0 - Unauthenticated RCE via PHP Object Injection
CVE-2026-18048 WP Photo Album Plus < 9.2.07.002 - Unauthenticated Arbitrary ZIP File Deletion via delmyzi
CVE-2026-18046 Cookie Consent < 0.0.10 - Subscriber+ MaxMind License Key Update

Showing top 20 of 44 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Payment Gateway for PayPal on WooCommerce
Same vendor: Unknown

V. Comments for CVE-2026-16621

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