CVE-2026-27390: WeDesignTech Booking Auth Bypass Flaw

CVE-2026-27390 Overview

CVE-2026-27390 is an Authentication Bypass Using an Alternate Path or Channel vulnerability affecting the WeDesignTech Ultimate Booking Addon WordPress plugin. This vulnerability allows attackers to abuse the authentication mechanism, potentially leading to account takeover scenarios. The flaw exists in versions up to and including 1.0.1 of the plugin.

Critical Impact

This authentication bypass vulnerability enables attackers to abuse authentication mechanisms and potentially take over user accounts on affected WordPress sites running the vulnerable booking addon plugin.

Affected Products

• WeDesignTech Ultimate Booking Addon (wedesigntech-ultimate-booking-addon) versions n/a through 1.0.1

Discovery Timeline

• 2026-03-05 - CVE-2026-27390 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27390

Vulnerability Analysis

This vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path or Channel). The authentication bypass flaw in the WeDesignTech Ultimate Booking Addon plugin allows attackers to circumvent standard authentication procedures by exploiting an alternate authentication path within the plugin's architecture.

The vulnerability enables Authentication Abuse, which can lead to unauthorized access to user accounts. In WordPress environments, such authentication bypass vulnerabilities can have severe consequences, potentially allowing attackers to access sensitive booking information, modify reservations, or escalate privileges within the WordPress installation.

Root Cause

The root cause of this vulnerability lies in the plugin's authentication implementation, where an alternate path or channel exists that bypasses the intended authentication checks. This typically occurs when developers implement multiple authentication methods or entry points without properly validating credentials across all paths. The plugin fails to enforce consistent authentication validation, allowing attackers to exploit the alternate channel to gain unauthorized access.

Attack Vector

The attack vector for this authentication bypass involves exploiting the alternate authentication path present in the WeDesignTech Ultimate Booking Addon plugin. An attacker can leverage this vulnerability to bypass normal authentication requirements and abuse the authentication mechanism to gain unauthorized access to user accounts.

The vulnerability mechanism works by exploiting inconsistencies in how the plugin handles authentication across different code paths. When a request is made through the alternate channel, the expected authentication checks are not properly enforced, allowing the attacker to authenticate as another user without proper credentials. For detailed technical information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-27390

Indicators of Compromise

• Unusual authentication requests to WordPress booking-related endpoints that bypass standard login flows
• Multiple failed authentication attempts followed by successful access without proper credential submission
• Anomalous user account activity or unauthorized modifications to booking records
• Server logs showing requests to alternate authentication endpoints within the booking plugin

Detection Strategies

• Implement WordPress security plugins capable of monitoring authentication anomalies and suspicious login patterns
• Monitor server access logs for unusual requests targeting the wedesigntech-ultimate-booking-addon plugin endpoints
• Deploy Web Application Firewall (WAF) rules to detect and block authentication bypass attempts
• Utilize SentinelOne's behavioral analysis to identify exploitation attempts targeting WordPress authentication mechanisms

Monitoring Recommendations

• Enable detailed logging for all authentication events on WordPress installations using this plugin
• Configure alerts for successful authentications that occur without corresponding credential validation events
• Monitor for unexpected privilege changes or account modifications within the booking system
• Implement real-time monitoring of plugin-related HTTP requests for anomalous patterns

How to Mitigate CVE-2026-27390

Immediate Actions Required

• Disable the WeDesignTech Ultimate Booking Addon plugin immediately until a patch is available
• Review WordPress user accounts for any unauthorized access or suspicious modifications
• Audit booking records and user data for signs of compromise
• Implement additional authentication layers such as two-factor authentication for WordPress administrators

Patch Information

As of the last update, versions through 1.0.1 remain vulnerable. WordPress site administrators should monitor the plugin's official update channels and the Patchstack Vulnerability Report for patch availability. Once a security update is released, apply it immediately to remediate this vulnerability.

Workarounds

• Deactivate the wedesigntech-ultimate-booking-addon plugin until a security patch is available
• Implement IP-based access restrictions for WordPress administrative functions
• Deploy a Web Application Firewall with rules to block authentication bypass attempts
• Consider using alternative booking solutions that do not have known authentication vulnerabilities

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate wedesigntech-ultimate-booking-addon

# Verify the plugin is disabled
wp plugin list --name=wedesigntech-ultimate-booking-addon --field=status