Executive Summary

CVE-2026-39668 is a Broken Access Control vulnerability in the WordPress Book Previewer for Woocommerce Plugin versions up to and including 1.0.6.

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 means that attackers can exploit incorrectly configured access control security levels to bypass restrictions.

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Impact Analysis

The vulnerability allows unauthenticated attackers to perform privileged actions without proper authorization.

Although the CVSS severity score is 5.3, indicating a low priority threat with limited impact, attackers could potentially use this flaw in mass-exploit campaigns targeting many websites indiscriminately.

Immediate mitigation involves updating the affected plugin if possible or seeking assistance from hosting providers or web developers.

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Detection Guidance

This vulnerability arises from missing authorization, authentication, or nonce token checks in certain functions of the Book Previewer for Woocommerce plugin, allowing unauthenticated users to perform privileged actions.

Since no official patch or specific detection commands are provided, detection would involve checking if the affected plugin version (up to and including 1.0.6) is installed and if unauthorized access attempts to privileged functions are occurring.

You can check the plugin version installed on your WordPress site by running the following WP-CLI command:

• wp plugin list --status=active | grep book-previewer-for-woocommerce

Additionally, monitoring web server logs for unusual or unauthorized requests targeting the plugin's endpoints may help detect exploitation attempts.

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Mitigation Strategies

Immediate mitigation involves updating the affected plugin if an update is available.

Since no official patch is currently available for this vulnerability, you should seek assistance from your hosting provider or web developers to implement temporary access control measures.

Other steps include restricting access to the plugin's functionality through web application firewalls or other security controls to prevent unauthenticated exploitation.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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