CVE-2025-57889 in InPost Gallery Plugin
Summary
by MITRE • 09/05/2025
Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in RealMag777 InPost Gallery allows PHP Local File Inclusion. This issue affects InPost Gallery: from n/a through 2.1.4.5.
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Analysis
by VulDB Data Team • 09/05/2025
The CVE-2025-57889 vulnerability represents a critical PHP Remote File Inclusion flaw that manifests through improper control of filename parameters in include/require statements within the RealMag777 InPost Gallery plugin. This vulnerability falls under the broader category of PHP Local File Inclusion (LFI) attacks and is classified as a CWE-98 weakness, which specifically addresses the improper control of filename for include/require statements. The vulnerability exists in the InPost Gallery plugin version range from an unspecified starting point through version 2.1.4.5, indicating that all versions within this range are susceptible to exploitation.
The technical implementation of this vulnerability occurs when the plugin fails to properly validate or sanitize user-supplied input that is used in PHP include or require statements. When attackers can manipulate parameters that control which files are included in the PHP execution context, they can potentially load arbitrary local files or even remote files if remote file inclusion is enabled on the server. This misconfiguration allows attackers to execute arbitrary PHP code on the target server, effectively bypassing normal access controls and potentially leading to complete system compromise. The vulnerability is particularly dangerous because it leverages the fundamental PHP functionality of including files, which is commonly used for modular code organization and dynamic content loading.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to access sensitive system files, potentially exposing database credentials, configuration files, or other critical information. Attackers could exploit this vulnerability to establish persistent backdoors, escalate privileges, or conduct further reconnaissance within the compromised environment. The attack surface is significantly broadened because the vulnerability affects a widely used gallery plugin, making it an attractive target for automated exploitation campaigns. This type of vulnerability is particularly concerning in environments where the plugin is installed on public-facing websites, as it provides an entry point for attackers to gain unauthorized access to the underlying system infrastructure.
Mitigation strategies for CVE-2025-57889 should prioritize immediate patching of the InPost Gallery plugin to a version that properly validates and sanitizes user input before using it in include/require statements. Security practitioners should implement input validation mechanisms that strictly enforce whitelisting of acceptable file names and paths, ensuring that user-supplied parameters cannot be used to traverse directory structures or reference arbitrary files. The principle of least privilege should be enforced by configuring PHP with remote file inclusion disabled through the allow_url_include directive set to off. Additionally, implementing web application firewalls with rules designed to detect and block suspicious include/require parameter patterns can provide additional defense in depth. Organizations should also conduct regular security assessments of their web applications to identify similar vulnerabilities in other components and ensure proper security configurations are maintained across all systems. This vulnerability aligns with ATT&CK technique T1505.003 for web shell deployment and T1078 for valid accounts, as exploitation typically involves gaining access through compromised web applications and establishing persistent access through malicious code execution.