CVE-2026-11901 Business logic in WP Hotel Booking
Unauthenticated attackers can bypass payment verification in WP Hotel Booking to mark bookings as paid without genuine payment.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11901?
CVE-2026-11901 is a medium-severity vulnerability in thimpress WP Hotel Booking, published on 11 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-345
Which versions are affected by CVE-2026-11901?
How do I fix CVE-2026-11901?
No fix has been published for CVE-2026-11901 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11901 being exploited?
There is no known exploitation of CVE-2026-11901 in the wild and no public exploit code.
Sources
Also known as GHSA-8frr-75wq-jfgf.