CVE-2026-57790 in Billey Plugin
Summary
by MITRE • 07/13/2026
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeMove Billey billey allows PHP Local File Inclusion.This issue affects Billey: from n/a through <= 2.1.8.
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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) vulnerabilities. This weakness occurs when an application allows user input to influence the file inclusion process without proper validation or sanitization, creating opportunities for attackers to execute arbitrary code or access sensitive files on the server. The specific instance affects ThemeMove Billey theme versions prior to 2.1.9, where the vulnerability manifests through inadequate input validation in file inclusion mechanisms.
The technical flaw stems from PHP's include/require functions being called with user-controllable parameters that are not properly sanitized before being used as filenames. Attackers can manipulate these parameters to include local files on the server or potentially remote files if the php.ini configuration allows remote file inclusion. This vulnerability is classified under CWE-98 in the Common Weakness Enumeration catalog, which specifically addresses improper control of filename for inclusion operations. The attack vector typically involves crafting malicious input that gets passed directly to PHP's include statement, allowing an attacker to execute arbitrary code or access sensitive system files.
The operational impact of this vulnerability is severe as it provides attackers with potential unauthorized access to the web server's file system and execution environment. Successful exploitation could allow attackers to read sensitive configuration files, database credentials, or other critical data stored on the server. The vulnerability also enables privilege escalation attacks where attackers can potentially execute malicious code with the privileges of the web server process. In the context of WordPress themes like Billey, this could lead to complete compromise of the WordPress installation and potentially the entire hosting environment, as demonstrated by attack patterns observed in similar LFI vulnerabilities affecting content management systems.
Mitigation strategies for this vulnerability involve implementing proper input validation and sanitization techniques that prevent user-controllable data from influencing file inclusion operations. Developers should employ whitelisting approaches where only predefined, safe filenames are allowed for inclusion rather than accepting arbitrary user input. Additionally, disabling remote file inclusion in php.ini configuration files and using absolute paths for include statements can significantly reduce the attack surface. The remediation process requires updating to the patched version of ThemeMove Billey 2.1.9 or later, as specified in the vulnerability scope, along with implementing secure coding practices that align with OWASP Top Ten security guidelines. Security controls should also include monitoring for suspicious file inclusion patterns and implementing proper access controls to limit the impact of potential exploitation attempts, following principles outlined in the MITRE ATT&CK framework for defensive measures against code injection vulnerabilities.