CVE-2026-57802 in Struktur Plugin
Summary
by MITRE • 07/13/2026
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in Select-Themes Struktur struktur allows PHP Local File Inclusion.This issue affects Struktur: from n/a through <= 2.5.1.
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Analysis
by VulDB Data Team • 07/13/2026
The vulnerability described represents a critical improper control of filename for include/require statements in PHP applications, commonly known as PHP Remote File Inclusion or Local File Inclusion (LFI/RFI) attacks. This weakness occurs when an application incorporates user-supplied input directly into file inclusion functions without proper validation or sanitization. The specific vulnerability affects the Select-Themes Struktur theme version 2.5.1 and earlier, where the theme fails to properly validate filename parameters passed to PHP include/require statements. This flaw allows attackers to manipulate the include path through crafted input parameters, potentially enabling them to execute arbitrary code on the target server or access sensitive local files that should not be publicly accessible.
The technical implementation of this vulnerability stems from the theme's failure to sanitize user input before using it in PHP file inclusion operations. When a theme parameter is passed to an include or require statement without proper validation, attackers can inject malicious file paths that point to external remote servers or local system files. This typically occurs when the application uses functions like include(), require(), include_once(), or require_once() with variables derived from GET, POST, or COOKIE parameters. The vulnerability falls under CWE-98 and CWE-88 categories, which specifically address improper control of filename for include/require operations and improper neutralization of special elements used in os command construction respectively. These weaknesses create a direct pathway for attackers to execute arbitrary code or access unauthorized files through the web application's interface.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable complete system compromise. Attackers can leverage this weakness to include malicious PHP files from remote servers, effectively allowing them to execute arbitrary code on the target machine with the privileges of the web server process. Additionally, local file inclusion capabilities permit attackers to read sensitive system files such as configuration files, database credentials, or other critical application data that may be stored locally. This vulnerability directly maps to several ATT&CK techniques including T1505.003 for Server Software Component and T1213.002 for Data from Information Repositories, enabling adversaries to establish persistent access and escalate privileges within the compromised environment.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and sanitization measures throughout the application codebase. The primary defense mechanism involves implementing strict parameter validation before any file inclusion operations occur, ensuring that all user-supplied inputs are properly sanitized and restricted to predefined safe values. Developers should employ whitelisting approaches where only known good filenames or paths are allowed, rather than accepting arbitrary input. Additionally, the PHP configuration should disable remote file inclusion capabilities by setting allow_url_include=Off in php.ini, which prevents the include/require functions from accepting URLs as parameters. Regular security code reviews and automated static analysis tools should be implemented to identify similar patterns throughout the application. The vulnerability also highlights the importance of keeping all third-party themes and plugins updated, as outdated components often contain known vulnerabilities that attackers can exploit to gain unauthorized access to systems.