CVE-2025-48126 is a high-severity vulnerability classified under CWE-98, which pertains to improper control of filenames used in include or require statements within PHP programs. Specifically, this vulnerability affects the g5theme Essential Real Estate product, versions up to and including 5.2.1. The flaw allows an attacker to perform a PHP Local File Inclusion (LFI) attack, which can lead to remote code execution or disclosure of sensitive files on the server. The vulnerability arises because the application does not properly validate or sanitize user-supplied input that determines the filename to be included or required by the PHP script. This lack of control enables an attacker to manipulate the filename parameter to include arbitrary files from the server's filesystem. The CVSS v3.1 base score of 8.1 reflects the critical impact on confidentiality, integrity, and availability, with an attack vector of network (AV:N), high attack complexity (AC:H), no privileges required (PR:N), and no user interaction (UI:N). The scope is unchanged (S:U), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the vulnerability's nature and severity make it a significant risk. The absence of available patches at the time of publication increases the urgency for mitigation. This vulnerability is particularly dangerous because it can allow attackers to execute arbitrary PHP code, potentially leading to full system compromise, data leakage, or service disruption. Given that Essential Real Estate is a theme used in web environments, the attack surface includes web servers running the affected theme, which are accessible over the internet.

For European organizations using the g5theme Essential Real Estate product, this vulnerability poses a substantial risk. Exploitation could lead to unauthorized access to sensitive customer data, internal documents, or credentials stored on the web server. The integrity of the website and backend systems could be compromised, allowing attackers to deface websites, inject malicious content, or pivot to other internal systems. Availability could also be impacted if attackers disrupt services or deploy ransomware. Given the high CVSS score and the fact that no authentication or user interaction is required, the threat is severe for organizations relying on this theme for their real estate web presence. This could affect real estate agencies, property management firms, and related service providers across Europe, potentially leading to reputational damage, regulatory fines under GDPR for data breaches, and operational downtime. The lack of known exploits in the wild currently provides a small window for remediation before active exploitation begins.

1. Immediate mitigation should include disabling or removing the g5theme Essential Real Estate theme from production environments until a patch is available. 2. Implement strict input validation and sanitization on all parameters that influence file inclusion paths, ensuring only allowed filenames or whitelisted paths can be used. 3. Employ web application firewalls (WAFs) with rules designed to detect and block attempts at local file inclusion attacks targeting PHP applications. 4. Restrict PHP's file inclusion capabilities by configuring php.ini settings such as 'allow_url_include=Off' and using open_basedir restrictions to limit accessible directories. 5. Monitor web server logs for suspicious requests that attempt to manipulate include parameters or access sensitive files. 6. Plan for an immediate update or patch deployment once the vendor releases a fix. 7. Conduct a thorough security audit of all PHP-based themes and plugins to identify similar vulnerabilities. 8. Educate development and operations teams about secure coding practices related to file inclusion and input validation.