CVE-2026-2262: Easy Appointments Information Disclosure

CVE-2026-2262 Overview

The Easy Appointments plugin for WordPress contains a sensitive information exposure vulnerability affecting all versions up to and including 3.12.21. The flaw resides in the /wp-json/wp/v2/eablocks/ea_appointments/ REST API endpoint, which is registered with 'permission_callback' => '__return_true'. This configuration bypasses any authentication or authorization checks, allowing unauthenticated remote attackers to retrieve customer appointment records. Exposed data includes full names, email addresses, phone numbers, IP addresses, appointment descriptions, and pricing information. The issue is tracked as [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor.

Critical Impact

Unauthenticated attackers can extract personally identifiable information (PII) and customer appointment records from any WordPress site running Easy Appointments 3.12.21 or earlier.

Affected Products

• Easy Appointments plugin for WordPress, versions through 3.12.21
• WordPress sites exposing the /wp-json/wp/v2/eablocks/ea_appointments/ REST endpoint
• Fixed in Easy Appointments 3.12.22

Discovery Timeline

• 2026-04-18 - CVE-2026-2262 published to NVD
• 2026-04-22 - Last updated in NVD database

Technical Details for CVE-2026-2262

Vulnerability Analysis

The Easy Appointments plugin registers a custom WordPress REST API route to deliver appointment data to its block editor components. The route handler is declared with 'permission_callback' => '__return_true', a WordPress helper that returns boolean true for every request. As a result, WordPress invokes the data callback without verifying nonces, capabilities, or user sessions.

Any anonymous client can issue a single HTTP GET request to /wp-json/wp/v2/eablocks/ea_appointments/ and receive the full appointment dataset as JSON. The response contains personally identifiable information (PII) tied to bookings: customer names, email addresses, phone numbers, originating IP addresses, free-text appointment descriptions, and price fields.

The vulnerability is purely an authorization defect. There is no injection, memory corruption, or write primitive. The impact is confined to confidentiality, but the data exposed enables downstream phishing, fraud, and regulatory exposure under GDPR, CCPA, and HIPAA-adjacent frameworks.

Root Cause

The root cause is an insecure permission callback on a privileged REST route. WordPress requires every register_rest_route call to define a permission_callback, and the __return_true value disables the check entirely. The endpoint should have validated that the caller holds an administrative capability such as manage_options or edit_posts before returning customer records.

Attack Vector

Exploitation requires only network access to the WordPress site. An attacker sends an unauthenticated HTTP GET request to the vulnerable REST endpoint. The server responds with a JSON array containing every appointment record stored by the plugin. Automated scanners can enumerate WordPress sites running Easy Appointments and harvest data at scale. The Wordfence-published EPSS score of 29.108% places this CVE in the 96th percentile of likely-exploited vulnerabilities.

Readers can review the vulnerable code in the upstream repository: WordPress Easy Appointments Block Code and the fix in WordPress Changeset 3485692.

Detection Methods for CVE-2026-2262

Indicators of Compromise

• Web server access logs containing GET requests to /wp-json/wp/v2/eablocks/ea_appointments/ from unauthenticated sources
• HTTP 200 responses to the above endpoint with Content-Type: application/json and large response bodies
• Requests originating from known scanning infrastructure or anonymizing proxies targeting the wp-json namespace
• Bursts of sequential requests against multiple wp-json routes consistent with REST API enumeration

Detection Strategies

• Inspect HTTP logs for any external client accessing /wp-json/wp/v2/eablocks/ea_appointments/ and alert on requests lacking a valid authenticated session cookie
• Deploy a web application firewall (WAF) rule that blocks unauthenticated requests to the eablocks/ea_appointments route
• Run version checks across managed WordPress estates to identify Easy Appointments installations at or below version 3.12.21

Monitoring Recommendations

• Forward WordPress access logs and wp-json request telemetry into a centralized SIEM for correlation across sites
• Baseline normal wp-json traffic volume and alert on anomalous spikes against appointment or customer-data endpoints
• Monitor outbound data transfer sizes from WordPress hosts to detect bulk JSON exfiltration

How to Mitigate CVE-2026-2262

Immediate Actions Required

• Update the Easy Appointments plugin to version 3.12.22 or later on every affected WordPress installation
• Audit web server access logs for prior unauthenticated requests to /wp-json/wp/v2/eablocks/ea_appointments/ and treat positive hits as a data breach event
• Notify affected customers and meet applicable breach-notification obligations if exposure is confirmed

Patch Information

The vendor addressed the issue in Easy Appointments 3.12.22 by replacing the __return_true permission callback with an authenticated capability check. The full diff is available in WordPress Changeset 3485692 and the version delta in WordPress Version Change 3.12.21 to 3.12.22. Additional analysis is available from Wordfence.

Workarounds

• If patching is delayed, deactivate the Easy Appointments plugin until the update can be applied
• Restrict access to /wp-json/wp/v2/eablocks/ at the WAF or reverse proxy layer, allowing only authenticated administrative IP ranges
• Disable anonymous access to the WordPress REST API using a hardening plugin or custom rest_authentication_errors filter

# Example nginx rule to block unauthenticated access to the vulnerable route
location ~* ^/wp-json/wp/v2/eablocks/ea_appointments {
    deny all;
    return 403;
}