CVE-2026-24371: BA Book Everything Auth Bypass Flaw

CVE-2026-24371 Overview

CVE-2026-24371 is a Missing Authorization vulnerability (CWE-862) affecting the BA Book Everything WordPress plugin developed by bookingalgorithms. This Broken Access Control vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized actions within the WordPress booking system.

The vulnerability stems from missing authorization checks in the plugin's functionality, which could allow unauthenticated or low-privileged users to access or modify resources they should not have permission to interact with.

Critical Impact
Attackers can bypass access control mechanisms in the BA Book Everything plugin, potentially allowing unauthorized booking modifications, data access, or administrative actions without proper authentication.

Affected Products

BA Book Everything WordPress plugin version 1.8.16 and earlier
WordPress installations running vulnerable versions of the ba-book-everything plugin

Discovery Timeline

January 22, 2026 - CVE-2026-24371 published to NVD
January 22, 2026 - Last updated in NVD database

Technical Details for CVE-2026-24371

Vulnerability Analysis

This vulnerability falls under CWE-862 (Missing Authorization), a common weakness in web applications where critical functions fail to verify that the requesting user has the necessary permissions to perform the requested action.

In the context of WordPress plugins, missing authorization typically occurs when AJAX handlers, REST API endpoints, or other plugin functions do not properly check user capabilities before executing privileged operations. The BA Book Everything plugin, which handles booking functionality, may expose sensitive operations such as booking management, configuration changes, or data access without adequate permission verification.

Root Cause

The root cause is the absence of proper authorization checks in the BA Book Everything plugin's code. WordPress plugins should implement capability checks using functions like current_user_can() to verify user permissions before processing requests. When these checks are missing or improperly implemented, unauthorized users can invoke functionality intended only for administrators or other privileged roles.

This type of vulnerability commonly manifests in:

AJAX action handlers registered with wp_ajax_nopriv_* hooks without proper capability verification
REST API endpoints lacking permission callbacks
Form processing functions that don't validate user roles

Attack Vector

An attacker can exploit this vulnerability by sending crafted requests directly to the vulnerable endpoints within the BA Book Everything plugin. Since authorization checks are missing, the plugin processes these requests regardless of the user's authentication status or permission level.

The attack typically involves:

Identifying vulnerable AJAX actions or REST API endpoints exposed by the plugin
Crafting HTTP requests that target these endpoints
Manipulating booking data, accessing sensitive information, or performing administrative actions without authentication

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Plugin Advisory.

Detection Methods for CVE-2026-24371

Indicators of Compromise

Unusual booking modifications or deletions without corresponding admin activity logs
Unexpected changes to plugin settings or configurations
Anomalous HTTP requests to BA Book Everything AJAX endpoints from unauthenticated sessions
Database changes to booking-related tables without legitimate user actions

Detection Strategies

Monitor WordPress access logs for requests to admin-ajax.php with BA Book Everything action parameters from unauthenticated users
Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting the plugin's endpoints
Review plugin audit logs for unauthorized modifications to booking data
Enable WordPress debug logging to capture authorization failures

Monitoring Recommendations

Configure real-time alerting for changes to booking configurations or data outside normal business processes
Implement file integrity monitoring on the WordPress plugins directory
Monitor for new user accounts or privilege escalation attempts that may indicate exploitation
Review web server logs for patterns consistent with broken access control exploitation

How to Mitigate CVE-2026-24371

Immediate Actions Required

Update the BA Book Everything plugin to the latest patched version immediately
Review recent booking data and plugin settings for unauthorized modifications
Temporarily disable the plugin if an update is not available and the functionality is not critical
Implement WAF rules to restrict access to plugin AJAX and REST endpoints

Patch Information

Users should update the BA Book Everything plugin to a version newer than 1.8.16 that addresses this vulnerability. Check the plugin's changelog and the Patchstack advisory for the specific patched version.

WordPress administrators can update plugins through:

The WordPress admin dashboard under Plugins → Updates
WP-CLI using wp plugin update ba-book-everything
Manual download and installation from the WordPress plugin repository

Workarounds

Restrict access to admin-ajax.php for unauthenticated users if the booking functionality is only needed for logged-in users
Implement server-level access controls to limit requests to the plugin's endpoints
Use a security plugin with virtual patching capabilities to block exploitation attempts
Consider temporarily deactivating the plugin until an official patch is available

bash

# WordPress CLI command to check plugin version
wp plugin list --name=ba-book-everything --fields=name,version,update_version

# Update the plugin via WP-CLI
wp plugin update ba-book-everything