CVE-2025-58879 in Festy Plugin
Summary
by MITRE • 12/18/2025
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in AncoraThemes Festy festy allows PHP Local File Inclusion.This issue affects Festy: from n/a through <= 1.13.0.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 12/18/2025
The CVE-2025-58879 vulnerability represents a critical PHP Remote File Inclusion flaw in the AncoraThemes Festy theme, specifically impacting versions through 1.13.0. This vulnerability stems from improper control of filename parameters in include/require statements, creating an avenue for attackers to execute arbitrary code through manipulated file inclusion directives. The flaw fundamentally compromises the application's security model by allowing remote attackers to inject and execute malicious code from external sources, potentially leading to complete system compromise.
The technical implementation of this vulnerability occurs when the Festy theme fails to properly validate or sanitize user-supplied input used in PHP include/require functions. When an attacker can manipulate parameters that influence file inclusion paths, they can redirect the execution flow to load and execute arbitrary PHP files from remote servers. This type of vulnerability is classified as CWE-88, which specifically addresses improper control of filename for include/require statements, making it a direct descendant of the broader CWE-94 category for code injection vulnerabilities. The vulnerability operates at the application layer, specifically targeting the PHP interpreter's file inclusion mechanisms.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a foothold for further exploitation within the target environment. Successful exploitation could enable attackers to establish persistent backdoors, escalate privileges, or even achieve complete system compromise. The vulnerability's reach is particularly concerning as it affects a widely used WordPress theme, potentially exposing thousands of websites to remote code execution attacks. This type of vulnerability aligns with ATT&CK technique T1190, which describes exploiting vulnerabilities in software to gain remote code execution, and T1059, which covers the use of command and scripting interpreters for execution.
Mitigation strategies for this vulnerability should focus on immediate patching of affected versions, as the most effective solution involves upgrading to a patched version of the Festy theme. Additionally, implementing proper input validation and sanitization measures within the application code can prevent malicious parameters from reaching include/require functions. Network-level defenses such as web application firewalls and strict file inclusion policies can provide additional layers of protection. Organizations should also consider implementing least privilege principles and monitoring for suspicious file inclusion patterns. The vulnerability's classification under CWE-88 and its relationship to PHP's include/require functions make it essential for developers to follow secure coding practices that validate all user inputs before they are used in dynamic file operations, aligning with the principles of secure software development lifecycle practices.