CVE-2026-19406: Easy Appointments Information Disclosure

CVE-2026-19406 Overview

CVE-2026-19406 is an information disclosure vulnerability in the Easy Appointments WordPress plugin before version 4.0.1. The plugin fails to restrict one of its appointment-listing REST endpoints to records owned by the requesting user. Any authenticated user with contributor-level access can retrieve all bookings stored on the site, including customer names, appointment schedules, and booking statuses. The weakness is classified under [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor. Exploitation requires authenticated access but no user interaction, and it exposes personally identifiable information belonging to site customers.

Critical Impact
Authenticated contributor-level users can read all appointment bookings, exposing customer names, schedules, and statuses across the entire site.

Affected Products

Easy Appointments WordPress plugin versions prior to 4.0.1
WordPress sites granting contributor-level or higher access to untrusted users
Sites relying on the plugin's REST API for appointment management

Discovery Timeline

2026-08-19 - CVE-2026-19406 published to NVD
2026-08-19 - Last updated in NVD database

Technical Details for CVE-2026-19406

Vulnerability Analysis

The Easy Appointments plugin exposes a REST API endpoint that returns appointment records. The endpoint performs authentication checks but does not apply a per-user authorization filter on the underlying query. As a result, the endpoint returns bookings for every user rather than only bookings associated with the caller. A contributor-level account, which is typically granted for limited content authoring, can invoke the endpoint and receive the full appointment dataset. Returned fields include customer names, appointment times, and status values, all of which qualify as personal data under most privacy regimes.

Root Cause

The root cause is broken access control at the REST endpoint layer. The plugin verifies that the request originates from an authenticated session but omits an ownership or role check on the records it returns. This is a classic missing authorization defect where the resource handler treats authentication as sufficient proof of authorization.

Attack Vector

An attacker first obtains contributor-level credentials, either through legitimate account provisioning, self-registration where enabled, or credential theft. The attacker then sends a request to the vulnerable REST endpoint using the authenticated session. The server responds with the complete list of bookings. No elevated privileges, no user interaction, and no client-side execution are required. Refer to the WPScan Vulnerability Report for endpoint specifics.

Detection Methods for CVE-2026-19406

Indicators of Compromise

Unexpected REST API requests from contributor accounts targeting Easy Appointments endpoints under /wp-json/.
Large or repeated responses from the appointment-listing endpoint returned to non-administrator sessions.
Contributor accounts accessing appointment data without a legitimate business reason.

Detection Strategies

Enable WordPress REST API request logging and alert on contributor-role calls to Easy Appointments endpoints.
Baseline normal REST traffic per role and flag deviations, especially bulk data retrieval by low-privilege accounts.
Correlate WordPress access logs with authentication events to identify accounts accessing appointment data outside their scope.

Monitoring Recommendations

Track the installed version of the Easy Appointments plugin across managed WordPress sites and alert on versions below 4.0.1.
Review contributor account creation and role changes for anomalies indicating account abuse.
Monitor outbound data transfer volumes from WordPress hosts to detect bulk exfiltration of appointment records.

How to Mitigate CVE-2026-19406

Immediate Actions Required

Upgrade the Easy Appointments plugin to version 4.0.1 or later on all WordPress installations.
Audit existing contributor-level accounts and revoke access for users who no longer require it.
Review appointment data access logs to determine whether the endpoint has been abused prior to patching.

Patch Information

The vendor addressed CVE-2026-19406 in Easy Appointments version 4.0.1. The fix restricts the affected REST endpoint so that it only returns bookings associated with the requesting user. Administrators should update through the WordPress plugin manager or by replacing the plugin files with the patched release. See the WPScan Vulnerability Report for reference details.

Workarounds

Restrict contributor and higher role assignments to trusted users until the plugin is updated.
Disable the Easy Appointments plugin on sites that cannot be patched immediately.
Place the REST API behind an application firewall rule that blocks contributor sessions from calling the affected endpoint.

bash

# Update the Easy Appointments plugin using WP-CLI
wp plugin update easy-appointments --version=4.0.1
wp plugin list --name=easy-appointments --fields=name,status,version