# Booking for Appointments and Events Calendar – Amelia <= 2.4.12 - Unauthenticated Payment Amount Manipulation via Client-Supplied Coupon and Tax Data

- **ID:** WPSEC-2026-1508
- **Plugin:** Booking for Appointments and Events Calendar – Amelia (`ameliabooking`), https://wordpress.org/plugins/ameliabooking/
- **Affected versions:** all versions before 2.4.13
- **Fixed in:** 2.4.13 (Update to 2.4.13 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-472
- **Usage among sites WPSec scans:** plugin Medium, affected versions Low (as of 2026-10-23)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/ameliabooking
- **Fix released:** 2026-10-22
- **Published:** 2026-10-23
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1508/

## Description

The Amelia plugin for WordPress is vulnerable to payment amount manipulation in all versions up to, and including, 2.4.12 due to the booking process trusting client-supplied coupon objects, tax data and price-related fields in public booking requests. These values were merged into the saved booking and used to calculate the payment amount without verifying that the coupon exists in the database. This makes it possible for unauthenticated attackers to book appointments or events at a reduced or arbitrary price.

## References

- https://wpsec.com/vuln/WPSEC-2026-1508/
- https://plugins.svn.wordpress.org/ameliabooking/tags/2.4.13/
- https://wordpress.org/plugins/ameliabooking/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1508/

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.