# VikBooking Hotel Booking Engine & PMS <= 1.8.16 - Unauthenticated Stored Cross-Site Scripting via Customer Email

- **ID:** WPSEC-2026-1405
- **Plugin:** VikBooking Hotel Booking Engine & PMS (`vikbooking`), https://wordpress.org/plugins/vikbooking/
- **Affected versions:** all versions before 1.8.17
- **Fixed in:** 1.8.17 (Update to 1.8.17 or later.)
- **Severity:** Medium 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-21)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/vikbooking
- **Fix released:** 2026-10-20
- **Published:** 2026-10-21
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1405/

## Description

The VikBooking Hotel Booking Engine & PMS plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the customer email field of the booking form in all versions up to, and including, 1.8.16, due to insufficient output escaping. The email validation accepts a quoted local part that contains double quotes and attribute text, and the stored value is printed without escaping into the value attribute of the cancellation and modification request forms on the front-end booking details page. This makes it possible for unauthenticated attackers who place a booking to inject arbitrary web scripts that execute when a user, such as a site administrator, opens the booking details page of a confirmed reservation.

## References

- https://wpsec.com/vuln/WPSEC-2026-1405/
- https://plugins.svn.wordpress.org/vikbooking/tags/1.8.17/
- https://wordpress.org/plugins/vikbooking/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1405/

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.