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CVE-2026-11901— WP Hotel Booking <= 2.3.1 - Unauthenticated Insufficient Verification of Data Authenticity to Payment Bypass via PayPal IPN Handler

Quick assessment

Affected
thimpress WP Hotel Booking
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 WP Hotel Booking是WordPress基金会的一款酒店预订管理组件。 WordPress WP Hotel Booking 2.3.1及之前版本存在输入验证错误漏洞，该漏洞源于web_hook_process_paypal_standard() IPN处理程序选择攻击者控制的$_REQUEST['test_ipn']参数中的PayPal验证端点，当test_ipn=1时强制将任何pending交易升级为completed，并在收到PayPal的VERIFIED响应后省略对

CVSS 5.3 · Medium EPSS 0.26% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
thimpress WP Hotel Booking ≤ 2.3.1 affected
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I. Basic Information for CVE-2026-11901

Vulnerability Information
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Vulnerability Title
WP Hotel Booking <= 2.3.1 - Unauthenticated Insufficient Verification of Data Authenticity to Payment Bypass via PayPal IPN Handler
Source: CVE Program / CVE List V5
Vulnerability Description
The WP Hotel Booking plugin for WordPress is vulnerable to Insufficient Verification of Data Authenticity in all versions up to, and including, 2.3.1. This is due to the `web_hook_process_paypal_standard()` IPN handler selecting its PayPal validation endpoint from the attacker-controlled `$_REQUEST['test_ipn']` parameter, force-upgrading any `pending` transaction to `completed` when `test_ipn=1`, and omitting post-verification checks on `receiver_email`, `mc_currency`, and `txn_id` uniqueness after receiving a `VERIFIED` response from PayPal. This makes it possible for unauthenticated attackers to mark arbitrary hotel bookings as fully paid without submitting genuine payment to the merchant — either by routing IPN validation through PayPal's sandbox using a free sandbox account, or by replaying a previously verified IPN from a nominal payment to an attacker-controlled PayPal account. An attacker requires only a free PayPal sandbox account (or any PayPal account) to obtain a `VERIFIED` response; no site credentials or special configuration are needed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress WP Hotel Booking 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress WP Hotel Booking是WordPress基金会的一款酒店预订管理组件。 WordPress WP Hotel Booking 2.3.1及之前版本存在输入验证错误漏洞，该漏洞源于web_hook_process_paypal_standard() IPN处理程序选择攻击者控制的$_REQUEST['test_ipn']参数中的PayPal验证端点，当test_ipn=1时强制将任何pending交易升级为completed，并在收到PayPal的VERIFIED响应后省略对
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
thimpress WP Hotel Booking 0 ~ 2.3.1 -

II. Public POCs for CVE-2026-11901

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III. Intelligence Information for CVE-2026-11901

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Patches & Fixes for CVE-2026-11901 (6)

Vendor Advisories for CVE-2026-11901 (1)

IV. Related Vulnerabilities

Same product: WP Hotel Booking
Same vendor: thimpress
Same weakness: CWE-345

V. Comments for CVE-2026-11901

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