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 vulnerability exists in the REST API endpoint /wp-json/wp/v2/eablocks/ea_appointments/, which is registered with an insecure permission callback that allows access without any authentication or authorization checks. This security flaw enables unauthenticated attackers to extract sensitive customer appointment data including full names, email addresses, phone numbers, IP addresses, appointment descriptions, and pricing information.

Critical Impact

Unauthenticated attackers can access and exfiltrate sensitive customer PII including names, contact information, IP addresses, and appointment details from any WordPress site running the vulnerable plugin version.

Affected Products

• Easy Appointments plugin for WordPress versions up to and including 3.12.21
• WordPress sites utilizing Easy Appointments REST API endpoints
• Any site with the Easy Appointments Blocks (ea-blocks) component enabled

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

This vulnerability is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The core issue stems from improper access control implementation in the Easy Appointments plugin's REST API endpoint registration.

When the plugin registers its REST API route for appointment data, it uses the built-in WordPress permission callback __return_true, which unconditionally returns true for all requests. This effectively disables any authentication or authorization verification, allowing anyone—including unauthenticated external attackers—to query the appointment endpoint and retrieve all stored appointment records.

The exposed data includes highly sensitive personally identifiable information (PII) such as customer full names, email addresses, phone numbers, IP addresses collected during booking, detailed appointment descriptions, and pricing information. This combination of data presents significant privacy and security risks for affected businesses and their customers.

Root Cause

The root cause is the improper configuration of the REST API endpoint's permission callback. Instead of implementing proper capability checks or authentication verification, the endpoint registration uses 'permission_callback' => '__return_true'. This WordPress helper function simply returns true for any request, bypassing all access control mechanisms. The vulnerable code exists in the ea-blocks.php file of the Easy Appointments Blocks component.

Attack Vector

The attack vector is network-based and requires no user interaction or authentication. An attacker can exploit this vulnerability by simply sending an HTTP GET request to the exposed REST API endpoint:

/wp-json/wp/v2/eablocks/ea_appointments/

The endpoint responds with appointment data including customer PII without verifying whether the requester has appropriate permissions. Attackers can enumerate and extract all stored appointment records by iterating through the API responses. This attack can be automated at scale to target multiple WordPress installations using the vulnerable plugin.

Detection Methods for CVE-2026-2262

Indicators of Compromise

• Unusual or high-volume GET requests to /wp-json/wp/v2/eablocks/ea_appointments/ from external IP addresses
• Access log entries showing unauthenticated requests to the Easy Appointments REST API endpoints
• Requests to appointment endpoints from automated tools or uncommon user agents
• Evidence of bulk data retrieval from appointment-related API endpoints

Detection Strategies

• Monitor web server access logs for requests targeting /wp-json/wp/v2/eablocks/ endpoints from non-administrative users
• Implement rate limiting and anomaly detection for REST API endpoints to identify bulk data extraction attempts
• Deploy web application firewall (WAF) rules to detect and alert on suspicious patterns targeting WordPress REST API endpoints
• Utilize SentinelOne Singularity to monitor for data exfiltration patterns and suspicious outbound data transfers

Monitoring Recommendations

• Enable detailed logging for WordPress REST API requests and review logs regularly for unauthorized access patterns
• Set up alerts for any access to sensitive appointment data endpoints from external or unauthenticated sources
• Monitor network traffic for large data transfers from WordPress installations to unknown external hosts
• Implement endpoint detection and response (EDR) solutions to identify post-exploitation activities

How to Mitigate CVE-2026-2262

Immediate Actions Required

• Update the Easy Appointments plugin to version 3.12.22 or later immediately
• Audit access logs for any evidence of unauthorized access to the vulnerable endpoint prior to patching
• Notify affected customers if evidence of data exposure is discovered
• Consider temporarily disabling the Easy Appointments plugin if immediate update is not possible

Patch Information

The vulnerability has been addressed in Easy Appointments version 3.12.22. The fix implements proper permission checks for the REST API endpoint. The WordPress Easy Appointments Version Update shows the changes between the vulnerable and patched versions. Additionally, the WordPress Easy Appointments Changeset provides details on the specific code modifications. For additional vulnerability intelligence, review the Wordfence Vulnerability Analysis.

Workarounds

• Block external access to the /wp-json/wp/v2/eablocks/ path using web server configuration rules until the plugin can be updated
• Implement authentication requirements at the web server level for all WordPress REST API endpoints
• Use a web application firewall (WAF) to restrict access to sensitive REST API endpoints to authenticated users only

# Apache .htaccess workaround to block unauthenticated access to vulnerable endpoint
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-json/wp/v2/eablocks/ea_appointments [NC]
RewriteRule .* - [F,L]
</IfModule>