Easy Appointments <= 4.0.3 - Unauthenticated Authentication Bypass via Forgeable Legacy Appointment Action Token

ID

WPSEC-2026-1459

Plugin

Easy Appointments (easy-appointments)

Affected

from 4.0.3 before 4.0.4

Remediation

Update to 4.0.4 or later.

CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness

CWE-330

Usage

Plugin Low · Affected versions None seen among sites WPSec scans, 2026-10-22

Attack surface

Easy Appointments on WPSec AttackSurface

Fix released

2026-10-21

Published

2026-10-22

Description

The Easy Appointments plugin for WordPress is vulnerable to authentication bypass via the email action links (confirm/cancel) in version 4.0.3, due to a backward-compatible token fallback in validate_token() that accepts an MD5 hash of a salt hardcoded in the plugin, the appointment's creation timestamp and the action, with no limit on failed attempts. This makes it possible for unauthenticated attackers who know or guess an appointment ID and its creation time to forge valid tokens and confirm or cancel other customers' appointments.

References

• https://wpsec.com/vuln/WPSEC-2026-1459/
• https://plugins.svn.wordpress.org/easy-appointments/tags/4.0.4/
• https://wordpress.org/plugins/easy-appointments/

Published by WPSec. Provided as is, without warranty. Corrections: contact us.

This advisory as JSON or Markdown · All advisories: JSON, RSS