CVE-2026-107416 in Webba Booking Plugin
Summary
by MITRE • 10/15/2026
Authorization Bypass Through User-Controlled Key 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 6.5.2.
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Analysis
by VulDB Data Team • 10/15/2026
The identified vulnerability represents a critical failure in access control mechanisms within the Webba Booking plugin, specifically affecting versions ranging from no version restriction up to 6.5.2. This flaw is classified as an Authorization Bypass Through User-Controlled Key, which indicates that the application fails to properly validate whether the authenticated user has sufficient privileges to perform specific actions or access certain resources based on keys provided by the client side. In secure software architecture, authorization checks must be enforced server-side using immutable identifiers such as database primary keys or session-bound tokens rather than relying on values transmitted directly from the frontend interface that can be manipulated by an attacker.
From a technical perspective, this vulnerability allows malicious actors to manipulate parameters in HTTP requests to access data belonging to other users or administrative functions intended for higher-privileged roles. By altering user-controlled identifiers such as booking IDs, customer references, or role-based keys within API calls or form submissions, an attacker can bypass the application's logic that is supposed to restrict access based on the current session context. This type of flaw often stems from insecure direct object references where the system trusts client-supplied data without verifying it against server-side state and permission matrices. The absence of robust ownership verification means that any authenticated user with knowledge or ability to guess these keys can potentially view, modify, or delete sensitive booking information belonging to other clients.
The operational impact of this vulnerability is severe for businesses relying on the Webba Booking plugin for managing reservations, appointments, and customer data. Successful exploitation could lead to unauthorized disclosure of personally identifiable information including names, contact details, and payment histories associated with bookings made by others. Furthermore, attackers might be able to alter or cancel existing bookings, causing significant operational disruption and financial loss for both service providers and customers. In more advanced attack scenarios involving chained vulnerabilities, this access control bypass could serve as a stepping stone to achieve remote code execution if the manipulated data is subsequently processed in an unsafe manner by downstream components of the web application stack.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-639, which describes Authorization Bypass Through User-Controlled Key, and maps directly to the MITRE ATT&CK technique T1078, specifically Valid Accounts used for unauthorized access or privilege escalation within enterprise environments. The exploitation vector typically involves authenticated users since it relies on manipulating existing session contexts rather than breaking into an unauthenticated system initially.
To mitigate this risk, developers must implement strict server-side authorization checks that validate the current user's permissions against every resource accessed via a key provided by the client. It is essential to use indirect references or opaque identifiers instead of sequential numeric IDs where possible, although even then, ownership verification remains critical. Input validation should ensure that all keys correspond to resources explicitly owned by or accessible to the authenticated session making the request. Additionally, implementing comprehensive logging and monitoring for anomalous access patterns can help detect exploitation attempts in real-time. Organizations using affected versions must upgrade immediately to a patched version released after 6.5.2 where these access control logic flaws have been addressed through rigorous code review and security testing protocols aligned with OWASP guidelines for API security and web application protection.