Missing Authorization in TrueBooker ≤1.1.5 Enables Unauthorized Access

Executive Summary

CVE-2026-39663 is a Broken Access Control vulnerability in the WordPress TrueBooker plugin versions up to and including 1.1.5.

The issue arises from missing authorization, authentication, or nonce token checks in certain functions, which allows unauthenticated users to perform actions that normally require higher privileges.

This vulnerability falls under the OWASP Top 10 category A1: Broken Access Control.

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Impact Analysis

Exploiting this vulnerability allows unauthenticated users to perform privileged actions within the TrueBooker plugin, potentially compromising the security of the affected website.

However, the CVSS severity score is 5.3, indicating a low priority and low severity impact.

Although such vulnerabilities can be exploited in mass campaigns targeting many websites, this specific flaw is considered unlikely to be exploited with significant impact.

Currently, no official patch is available, so mitigation involves updating the plugin when a non-vulnerable version is released or seeking help from hosting providers or web developers.

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Detection Guidance

This vulnerability is a Broken Access Control issue in the TrueBooker WordPress plugin, caused by missing authorization checks allowing unauthenticated users to perform privileged actions.

There are no specific detection commands or network/system scanning instructions provided in the available resources.

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Mitigation Strategies

Currently, no official patch is available for this vulnerability.

The recommended mitigation is to update the affected TrueBooker plugin to a non-vulnerable version when it becomes available.

Alternatively, seek assistance from your hosting provider or web developers to implement temporary access control measures or workarounds.

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Compliance Impact

The vulnerability is a Broken Access Control issue that allows unauthenticated users to perform actions requiring higher privileges. Such unauthorized access could potentially lead to unauthorized data exposure or modification.

While the CVE description and resources do not explicitly mention compliance with standards like GDPR or HIPAA, broken access control vulnerabilities generally pose risks to data confidentiality and integrity, which are critical aspects of these regulations.

Therefore, if exploited, this vulnerability could negatively impact compliance with regulations that require strict access controls and protection of personal or sensitive data.

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