CVE-2026-28081 is a Local File Inclusion (LFI) vulnerability found in the ThemeREX Windsor WordPress theme, specifically affecting versions up to 2.5.0. The vulnerability arises from improper control over the filename parameter used in PHP include or require statements, allowing an attacker to manipulate the input to include arbitrary files from the server's filesystem. This can lead to disclosure of sensitive files such as configuration files, password files, or other data stored on the server. In some cases, LFI can be leveraged to execute arbitrary code if combined with other vulnerabilities or if the attacker can upload malicious files to the server. The vulnerability does not require authentication, making it accessible to unauthenticated remote attackers. No CVSS score has been assigned yet, and no known exploits have been reported in the wild. The issue was reserved on February 25, 2026, and published on March 5, 2026. The lack of patch links indicates that a fix may not yet be available, increasing the urgency for organizations to implement temporary mitigations or monitor for suspicious activity. The vulnerability affects a widely used WordPress theme, increasing the potential attack surface across many websites globally.

The primary impact of CVE-2026-28081 is unauthorized disclosure of sensitive information through Local File Inclusion. Attackers can read arbitrary files on the web server, potentially exposing credentials, configuration details, or other sensitive data. This can lead to further compromise, including privilege escalation or remote code execution if combined with other vulnerabilities. The vulnerability affects the integrity and confidentiality of affected systems. Availability impact is generally low unless the attacker uses the vulnerability to execute denial-of-service attacks indirectly. Since the vulnerability does not require authentication, it can be exploited by any remote attacker with network access to the vulnerable web server. Organizations running websites with the ThemeREX Windsor theme are at risk of data breaches, reputational damage, and potential regulatory penalties if sensitive customer or business data is exposed. The broad use of WordPress and popular themes like Windsor increases the global risk footprint.

1. Immediately update the ThemeREX Windsor theme to the latest version once a patch is released by the vendor. 2. Until a patch is available, implement web application firewall (WAF) rules to detect and block suspicious requests attempting to manipulate include or require parameters. 3. Restrict file permissions on the web server to limit access to sensitive files and directories, minimizing the impact of LFI exploitation. 4. Disable PHP functions such as include(), require(), include_once(), and require_once() from accepting user input where possible or sanitize and validate all inputs rigorously. 5. Monitor web server logs for unusual access patterns or attempts to include local files. 6. Employ security plugins or modules that can detect and prevent LFI attacks in WordPress environments. 7. Conduct regular security audits and vulnerability scans to identify and remediate similar issues proactively. 8. Educate development teams on secure coding practices to avoid improper input handling in PHP applications.