CVE-2026-116406 in Webba Booking Plugin
Summary
by MITRE • 10/29/2026
Missing Authorization vulnerability in Webba Plugins Webba Booking webba-booking-lite allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Webba Booking: from n/a through 6.5.4.
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Analysis
by VulDB Data Team • 10/29/2026
The identified security flaw represents a critical failure in access control mechanisms within the Webba Booking plugin, specifically affecting versions ranging from initial releases up to version 6.5.4. This vulnerability is classified as an Incorrectly Configured Access Control issue, which falls under the broader category of Missing Authorization vulnerabilities. In web application architecture, authorization determines what actions a user can perform after they have been authenticated. When this mechanism fails due to improper configuration or logic errors, it allows attackers to bypass intended restrictions and access resources or execute functions that should be restricted to authorized users only. This type of flaw is fundamentally rooted in the principle of broken object level authorization, where the application does not sufficiently verify whether a user has permission to perform an action on a specific resource.
From a technical perspective, this vulnerability likely stems from insufficient server-side validation of access rights for administrative or sensitive booking management functions. In many WordPress plugins, including those handling complex scheduling and payment data like Webba Booking, certain endpoints may rely solely on client-side checks or fail to verify the current user's role against the required permission level before processing requests. An attacker can exploit this by crafting direct HTTP requests that target internal API endpoints or administrative pages without possessing valid administrator credentials. By manipulating parameters such as post IDs, booking identifiers, or action tokens in these requests, an unauthorized actor can potentially view sensitive customer data, modify existing reservations, cancel bookings arbitrarily, or even alter pricing and availability settings. The absence of robust server-side authorization checks means that the application trusts the client's assertion of privilege rather than independently verifying it against a secure access control list stored on the server.
The operational impact of this vulnerability is severe due to the nature of the data handled by booking systems. These platforms typically store personally identifiable information, including names, email addresses, phone numbers, and sometimes payment details or billing history. Unauthorized access could lead to significant privacy breaches and compliance violations with regulations such as GDPR or CCPA. Furthermore, the ability to manipulate bookings can cause direct financial loss through fraudulent cancellations of high-value reservations or unauthorized modifications that disrupt business operations. For service providers relying on accurate scheduling, this lack of integrity in booking data can result in double-bookings, lost revenue, and reputational damage. The vulnerability essentially turns a standard administrative feature into an open door for malicious actors to interfere with core business logic without needing valid login credentials, thereby undermining the trust model of the entire application ecosystem.
In terms of industry standards, this flaw aligns closely with CWE-284 Improper Access Control and is often associated with CWE-639 Authorization Bypass Through User-Controlled Key if specific identifiers are manipulated to access other users' data. Within the MITRE ATT&CK framework for enterprise security, this behavior maps directly to T1078 Valid Accounts or potentially T1528 Steal Application Access Token depending on how authentication is bypassed, but more accurately reflects lateral movement techniques where an attacker exploits weak permissions within a trusted environment. It also relates to the OWASP Top 10 category of Broken Access Control, which consistently ranks as one of the most critical web application security risks due to its prevalence and potential for data exfiltration or system compromise.
To mitigate this vulnerability, immediate action is required by updating the Webba Booking plugin to a version later than 6.5.4 where these access control checks have been corrected. Developers should implement strict server-side authorization validation on all endpoints that handle sensitive booking operations, ensuring that every request verifies the user's role and permissions against a secure database of authorized actions before processing any state-changing logic. It is also advisable to employ principle of least privilege by restricting administrative functions exclusively to users with explicit administrator roles and implementing CSRF tokens to prevent cross-site request forgery attacks that might exploit these authorization gaps. Regular security audits and penetration testing focusing on access control flows are recommended to identify similar misconfigurations in other parts of the application stack, ensuring a comprehensive defense against unauthorized access attempts.