CVE-2026-13143: CWE-290 Authentication Bypass by Spoofing in WP Travel
The WP Travel WordPress plugin before 11.8.1 does not verify PayPal Instant Payment Notifications through the PayPal post-back handshake before marking a booking paid, allowing unauthenticated attackers to forge a notification that flips an arbitrary pending booking to a paid and booked state at an attacker-chosen amount.
AI Analysis
Technical Summary
CVE-2026-13143 is an authentication bypass vulnerability (CWE-290) in the WP Travel WordPress plugin prior to version 11.8.1. The flaw arises because the plugin fails to verify PayPal IPN messages through the required PayPal post-back handshake. As a result, attackers can spoof IPN notifications to manipulate booking statuses, converting pending bookings to paid and booked states with arbitrary payment amounts.
Potential Impact
An attacker can bypass authentication and payment verification mechanisms to fraudulently mark bookings as paid. This could lead to unauthorized bookings being confirmed without actual payment, causing financial loss and integrity issues for the affected site operators.
Mitigation Recommendations
No official patch or remediation guidance is currently available. Users should upgrade to WP Travel version 11.8.1 or later once released, as the vulnerability affects versions before 11.8.1. Until a fix is available, consider disabling PayPal IPN payment processing or implementing additional manual verification steps for bookings marked as paid via PayPal IPN.
CVE-2026-13143: CWE-290 Authentication Bypass by Spoofing in WP Travel
Description
The WP Travel WordPress plugin before 11.8.1 does not verify PayPal Instant Payment Notifications through the PayPal post-back handshake before marking a booking paid, allowing unauthenticated attackers to forge a notification that flips an arbitrary pending booking to a paid and booked state at an attacker-chosen amount.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-13143 is an authentication bypass vulnerability (CWE-290) in the WP Travel WordPress plugin prior to version 11.8.1. The flaw arises because the plugin fails to verify PayPal IPN messages through the required PayPal post-back handshake. As a result, attackers can spoof IPN notifications to manipulate booking statuses, converting pending bookings to paid and booked states with arbitrary payment amounts.
Potential Impact
An attacker can bypass authentication and payment verification mechanisms to fraudulently mark bookings as paid. This could lead to unauthorized bookings being confirmed without actual payment, causing financial loss and integrity issues for the affected site operators.
Mitigation Recommendations
No official patch or remediation guidance is currently available. Users should upgrade to WP Travel version 11.8.1 or later once released, as the vulnerability affects versions before 11.8.1. Until a fix is available, consider disabling PayPal IPN payment processing or implementing additional manual verification steps for bookings marked as paid via PayPal IPN.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-06-24T09:11:33.920Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6aee069c2644c7f8a7eee7
Added to database: 07/30/2026, 06:24:06 UTC
Last enriched: 07/30/2026, 07:08:43 UTC
Last updated: 07/31/2026, 01:35:20 UTC
Views: 6
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