CVE-2026-94228 in TrueBooker Plugin
Summary
by MITRE • 10/19/2026
The TrueBooker WordPress plugin before 1.3.0 does not perform any capability check on one of its setup handlers, and the token it does check is issued to unauthenticated visitors, allowing anyone to overwrite the plugin's entire configuration and to discard any setting they do not supply.
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Analysis
by VulDB Data Team • 10/19/2026
The TrueBooker WordPress plugin version 1.3.0 and earlier contains a critical security flaw rooted in improper access control mechanisms within its administrative setup handlers. This vulnerability stems from a failure to enforce capability checks, which are essential for verifying that the user initiating an action possesses the necessary permissions to modify sensitive system configurations. In secure web applications, particularly those built on content management systems like WordPress, any operation that alters core settings or plugin states must be gated by strict authentication and authorization protocols. The absence of these checks means that the application does not distinguish between legitimate administrators attempting to configure their booking system and malicious actors seeking to disrupt service or manipulate data. This represents a fundamental breakdown in the principle of least privilege, allowing actions intended for privileged users to be executed by any entity with network access to the target site.
The technical nature of this flaw is compounded by how the plugin handles security tokens. While the developer attempted to implement some form of protection using nonces or similar token-based mechanisms, the implementation was fundamentally flawed because these tokens are issued to unauthenticated visitors rather than being tied strictly to authenticated sessions with elevated privileges. In standard WordPress architecture, nonce verification ensures that a request originated from a legitimate source within an active session, but it does not inherently verify user roles if capability checks are omitted. By issuing tokens to anyone who can load the page or interact with the endpoint, the plugin effectively neutralizes this layer of defense against Cross-Site Request Forgery attacks. An attacker can easily craft malicious requests that include validly generated tokens, thereby bypassing what was intended as a protective measure and gaining unauthorized write access to critical configuration parameters.
The operational impact of this vulnerability is severe due to its potential for complete administrative takeover or service disruption without requiring any prior authentication credentials. Since the setup handler allows overwriting the plugin's entire configuration, an attacker can systematically discard settings they do not explicitly supply while modifying those they wish to change. This behavior leads to a loss of data integrity and availability, as essential booking parameters such as payment gateways, calendar limits, email notifications, or user roles can be altered arbitrarily. For businesses relying on TrueBooker for revenue generation or appointment scheduling, this could result in significant financial loss, reputational damage, and operational downtime. Furthermore, if the plugin interacts with other system components or stores sensitive customer data within its configuration array, an attacker might exploit these changes to facilitate further attacks, such as phishing campaigns via altered email templates or exfiltration of stored credentials embedded in settings files.
From a classification perspective, this vulnerability aligns closely with CWE-284, which describes Improper Access Control, specifically the failure to verify authorization before performing sensitive operations. It also maps directly to MITRE ATT&CK technique T1078, Valid Accounts, although in this specific case, no valid account is required at all due to the lack of authentication checks entirely. The scenario exemplifies a classic Broken Access Control vulnerability where the application logic fails to restrict actions based on user identity or role. This type of flaw is particularly dangerous because it often goes undetected by automated scanners that focus primarily on input validation issues like SQL injection, as the request structure itself may appear syntactically correct and technically valid from an HTTP perspective.
Mitigation strategies must prioritize immediate remediation through software updates followed by robust architectural hardening. The most effective solution is to upgrade the TrueBooker plugin to version 1.3.0 or later, where these access control deficiencies have been addressed by developers implementing proper capability verification using WordPress functions such as current_user_can(). For environments where upgrading is not immediately feasible, temporary mitigations include restricting access to the affected endpoints via web application firewall rules that block requests lacking valid session cookies associated with administrator roles. Additionally, site administrators should audit plugin configurations regularly and ensure that all installed plugins are kept up to date to minimize the attack surface. Implementing strict Content Security Policy headers can also help mitigate some aspects of cross-site request forgery by controlling which sources are allowed to submit forms or make API calls to the application domain.