Executive Summary

The WordPress MultiLoca Plugin, versions 4.2.15 and below, contains a high-priority Privilege Escalation vulnerability (CVE-2026-39546). This flaw allows attackers who have low-privilege accounts, such as Subscriber roles, to escalate their access rights to higher privileges within the website.

This means an attacker could potentially gain full control over the website by exploiting this vulnerability.

The issue is related to Identification and Authentication Failures, classified under OWASP Top 10 A7.

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Impact Analysis

If exploited, this vulnerability can allow an attacker with a low-privilege account to escalate their privileges and gain full control of the affected website.

This can lead to unauthorized access, modification, or deletion of website data, disruption of services, and potential compromise of sensitive information.

Because the vulnerability is considered highly dangerous and has a risk of mass exploitation, many websites using the vulnerable plugin could be targeted simultaneously.

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Mitigation Strategies

To mitigate the CVE-2026-39546 vulnerability, you should immediately update the WordPress MultiLoca Plugin to version 4.2.16 or later.

Alternatively, you can apply the mitigation rule provided by Patchstack if updating is not immediately possible.

It is also recommended to seek assistance from your hosting provider or developer to ensure proper protection against exploitation.

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Compliance Impact

The vulnerability allows attackers with low-privilege accounts to escalate their privileges and potentially gain full control of the website. This kind of privilege escalation can lead to unauthorized access to sensitive data, which may result in violations of data protection regulations such as GDPR and HIPAA.

Since the issue is classified under OWASP Top 10 A7 (Identification and Authentication Failures), it indicates a failure in access control mechanisms, which is critical for compliance with standards that require strict user authentication and authorization controls.

Therefore, if exploited, this vulnerability could compromise the confidentiality and integrity of personal or protected health information, potentially leading to non-compliance with regulations like GDPR and HIPAA.

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