WP Hotel Booking <= 2.3.1 — Unauthenticated Insufficient Verification of Data Authenticity to Payment Bypass via PayPal IPN Handler
CVE-2026-11901Published · Updated Action summary
Affected: ≤2.3.1Update to 2.3.2 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
WP Hotel Booking wp-hotel-booking
- Affected≤ 2.3.1
- Patched in2.3.2
Update to 2.3.2 or newer.
You are affected if you run ≤ 2.3.1. Version 2.3.2 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP Hotel Booking.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 2.3.2, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch WP Hotel Booking to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to valent1.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in WP Hotel Booking
All 28| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.5 | Authenticated (Custom role+) SQL Injection <2.3.2Update to 2.3.2 | CVE-2026-15153 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting via 'widget_search' Shortcode Attribute ≤2.3.2Update to 2.3.3 | CVE-2026-15464 | |
| Medium5.3 | Unauthenticated Price Manipulation ≤2.3.2Update to 2.3.3 | CVE-2026-15149 | |
| Medium6.1 | Reflected Cross-Site Scripting via 'check_in_date' Parameter ≤2.3.2Update to 2.3.3 | CVE-2026-15094 | |
| Medium6.1 | Reflected Cross-Site Scripting via 'check_in_date' and 'check_out_date' Parameters ≤2.3.1Update to 2.3.2 | CVE-2026-11392 |
- Medium6.5Authenticated (Custom role+) SQL Injection
<2.3.2Update to 2.3.2
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'widget_search' Shortcode Attribute
≤2.3.2Update to 2.3.3
- Medium5.3Unauthenticated Price Manipulation
≤2.3.2Update to 2.3.3
- Medium6.1Reflected Cross-Site Scripting via 'check_in_date' Parameter
≤2.3.2Update to 2.3.3
- Medium6.1Reflected Cross-Site Scripting via 'check_in_date' and 'check_out_date' Parameters
≤2.3.1Update to 2.3.2
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.