Compliance Impact

The vulnerability allows unauthenticated attackers to perform code injection, SQL injection, path traversal, denial of service, and other malicious activities, which can lead to unauthorized access and data breaches.

Such security breaches can result in non-compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and compromise.

Therefore, if exploited, this vulnerability could negatively impact an organization's ability to comply with these regulations due to potential data exposure and system integrity issues.

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Executive Summary

CVE-2026-39567 is a high-priority unauthenticated PHP Object Injection vulnerability found in WordPress Santé Theme versions 1.5.1 and below.

This flaw allows attackers to inject malicious PHP objects without needing to authenticate, potentially leading to code execution, SQL injection, path traversal, denial of service, and other harmful actions if a suitable POP (Property Oriented Programming) chain exists.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, data breaches through SQL injection, unauthorized file access via path traversal, and service disruption through denial of service attacks.

Because it is unauthenticated and exploitable remotely, attackers can target thousands of websites in mass campaigns, putting affected sites at significant risk.

Users of the vulnerable theme are strongly advised to update to version 1.6 or apply mitigation rules to block attacks until the update is applied.

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Mitigation Strategies

To mitigate the CVE-2026-39567 vulnerability in WordPress Santé Theme versions 1.5.1 and below, users should immediately update to version 1.6, which contains the patch for this PHP Object Injection flaw.

If updating immediately is not possible, applying Patchstack's mitigation rule to block attacks targeting this vulnerability is recommended until the update can be completed.

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Detection Guidance

The vulnerability affects WordPress Santé Theme versions 1.5.1 and below and is an unauthenticated PHP Object Injection flaw. Detection typically involves identifying if the vulnerable theme version is installed on your system.

Since the vulnerability is unauthenticated and can be exploited remotely, network detection can include monitoring for suspicious HTTP requests targeting the Santé theme endpoints that may attempt to exploit PHP Object Injection.

Specific commands or tools to detect this vulnerability are not provided in the available resources. However, general approaches include:

• Checking the installed version of the WordPress Santé theme to confirm if it is version 1.5.1 or below.
• Using vulnerability scanners that include checks for CVE-2026-39567 or scanning for known exploit patterns in web requests.
• Applying Patchstack's mitigation rule to block attacks until the theme is updated.

For example, to check the theme version on a WordPress installation, you can use the following command in the WordPress root directory:

• grep -i 'Version' wp-content/themes/sante/style.css

This command extracts the version number from the theme's style.css file. If the version is 1.5.1 or below, the site is vulnerable.

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