# VikBooking Hotel Booking Engine & PMS <= 1.8.17 - Cross-Site Request Forgery to Booking Modification and Custom Message Sending

- **ID:** WPSEC-2026-1434
- **Plugin:** VikBooking Hotel Booking Engine & PMS (`vikbooking`), https://wordpress.org/plugins/vikbooking/
- **Affected versions:** all versions before 1.8.18
- **Fixed in:** 1.8.18 (Update to 1.8.18 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-352
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-22)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/vikbooking
- **Fix released:** 2026-10-21
- **Published:** 2026-10-22
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1434/

## Description

The VikBooking Hotel Booking Engine & PMS plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.8.17 due to missing nonce validation when the booking edit view applies submitted changes and in the sendcustomsms and sendcustomemail tasks. This makes it possible for unauthenticated attackers to modify booking details such as amounts paid, refunds, payable amounts, cancellation fees, discounts, taxes, payment method, language, room units, customer email, phone and notes, to remove stored card details, or to send arbitrary SMS and email messages, via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

## References

- https://wpsec.com/vuln/WPSEC-2026-1434/
- https://plugins.svn.wordpress.org/vikbooking/tags/1.8.18/
- https://wordpress.org/plugins/vikbooking/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1434/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.