Improper File Inclusion in Struktur Core

Executive Summary

CVE-2026-57803 is a Local File Inclusion (LFI) vulnerability in the WordPress Struktur Core Plugin, affecting versions up to and including 2.5.1. This flaw allows attackers to include local files on the target website by improperly controlling the filename used in PHP include or require statements.

Exploiting this vulnerability could enable attackers to access sensitive files on the server, such as configuration files or database credentials, depending on the server's configuration.

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Detection Guidance

Detecting the PHP Local File Inclusion (LFI) vulnerability in the Struktur Core plugin (CVE-2026-57803) on your network or system involves checking for vulnerable plugin versions and testing for potential exploitation paths. Below are some methods and commands to help identify this vulnerability.

• Check the installed version of the Struktur Core plugin on your WordPress site. The vulnerability affects versions up to and including 2.5.1. You can verify the version by navigating to the WordPress admin dashboard, then going to 'Plugins' and locating the Struktur Core plugin. If the version is 2.5.1 or lower, the site is vulnerable.
• Use a WordPress vulnerability scanner like WPScan to detect the vulnerable plugin. Run the following command to scan your WordPress site: wpscan --url [your-website-url] --enumerate vp. Replace [your-website-url] with your site's URL. This will check for vulnerable plugins, including Struktur Core.
• Manually test for LFI vulnerabilities by attempting to access local files through the plugin's input parameters. For example, if the plugin accepts a file parameter, you can try accessing sensitive files like /etc/passwd (on Linux) or wp-config.php (WordPress configuration file) by crafting a URL like: http://[your-website-url]/wp-content/plugins/struktur-core/[vulnerable-endpoint]?file=../../../../etc/passwd. If the file contents are displayed, the site is vulnerable.
• Monitor web server logs for suspicious requests targeting the Struktur Core plugin. Look for patterns such as repeated requests with file inclusion payloads (e.g., ../../, file=, or include=). Use commands like grep to filter logs: grep -r 'struktur-core.*file=' /var/log/apache2/ or grep -r 'struktur-core.*include=' /var/log/nginx/.
• Use network scanning tools like Nmap to identify WordPress sites running the Struktur Core plugin. Run the following command to detect WordPress sites and their plugins: nmap -sV --script http-wordpress-enum --script-args type="plugins" [target-ip-or-domain]. This will help identify vulnerable instances.

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Impact Analysis

This vulnerability can impact you by allowing attackers to read sensitive files on your web server, potentially exposing confidential information like database credentials.

Such exposure can lead to further attacks, including data breaches or unauthorized access to your website's backend.

Although the CVSS score is 7.5 indicating high severity, the threat is considered low priority due to the complexity or conditions required for exploitation.

Attackers might exploit this vulnerability in mass campaigns targeting many websites running the affected plugin version.

There is currently no official patch available, so immediate updating or consulting with your hosting provider or web developer is advised.

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Compliance Impact

This vulnerability, a Local File Inclusion (LFI) flaw in the Struktur Core plugin, can affect compliance with standards and regulations like GDPR and HIPAA by potentially exposing sensitive data. If attackers exploit this vulnerability, they may access local files containing confidential information, such as database credentials or personally identifiable information (PII).

Under GDPR, unauthorized access to or exposure of personal data due to a security vulnerability could result in non-compliance, leading to significant fines and legal consequences. GDPR requires organizations to implement appropriate technical measures to protect personal data, and a known unpatched vulnerability may violate this requirement.

For HIPAA, if the affected system handles protected health information (PHI), the exposure of such data through this vulnerability could constitute a breach. HIPAA mandates safeguards to ensure the confidentiality, integrity, and availability of PHI, and failure to address this vulnerability may result in violations and penalties.

• Risk of data exposure: The vulnerability allows attackers to include local files, which may contain sensitive information, violating data protection principles.
• Lack of timely remediation: Since no official patch is available yet, organizations may struggle to meet compliance requirements that demand prompt vulnerability management.
• Third-party risk: If the affected plugin is used in a regulated environment, reliance on unpatched third-party software may introduce compliance risks.

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to update the Struktur Core plugin to the latest version beyond 2.5.1 as soon as an official patch becomes available.

If an update is not yet available, users are advised to seek assistance from their hosting provider or web developer to implement temporary protections or workarounds.

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