Unauthenticated Broken Access Control in Gillion

Executive Summary

CVE-2026-66477 is an Unauthenticated Broken Access Control vulnerability in the WordPress Gillion Theme versions 4.13 and below. It allows unauthenticated users to perform actions requiring higher privileges due to missing authorization, authentication, or nonce token checks.

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Detection Guidance

To detect this vulnerability, check if your Gillion theme version is 4.13 or below. You can do this by logging into your WordPress admin dashboard, navigating to Appearance > Themes, and verifying the installed version. Alternatively, use the command: wp theme list --status=active --format=json | grep -i gillion to list active themes and their versions via WP-CLI.

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Impact Analysis

Attackers may exploit this vulnerability in mass campaigns targeting thousands of websites. While the threat is low priority, it could allow unauthorized actions on your site if not patched. Users should update to version 4.14 or later immediately.

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Compliance Impact

This vulnerability may impact compliance with standards like GDPR and HIPAA by potentially allowing unauthorized access to sensitive data due to broken access control. Unauthenticated users could perform higher-privileged actions, risking data breaches or unauthorized modifications. However, the CVSS score of 5.3 suggests a low severity impact, meaning the risk is limited unless exploited at scale.

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Mitigation Strategies

Immediately update the Gillion theme to version 4.14 or later. If updating is not possible, seek assistance from your hosting provider or a web developer to apply necessary security patches. Regularly monitor for updates from the theme developer.

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