CVE-2026-28067 is a Local File Inclusion (LFI) vulnerability found in the ThemeREX Bassein WordPress theme, affecting versions up to 1.0.15. 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 information disclosure, such as reading configuration files, source code, or other sensitive data stored on the server. In some cases, if combined with other vulnerabilities or misconfigurations, it could allow remote code execution. The issue stems from insufficient input validation and sanitization of user-supplied data that controls file inclusion. Although no public exploits are currently documented, the nature of LFI vulnerabilities makes them attractive targets for attackers due to the potential to escalate privileges or pivot within the network. The vulnerability affects websites using the Bassein theme, which is a product of ThemeREX, commonly deployed in WordPress environments. No official patches or fixes have been linked yet, so users must rely on mitigations and monitoring until an update is released. The vulnerability was reserved and published in early 2026, indicating recent discovery and disclosure.

The impact of CVE-2026-28067 can be significant for organizations using the ThemeREX Bassein theme. Successful exploitation can lead to unauthorized disclosure of sensitive files, including configuration files containing database credentials, API keys, or other secrets. This can compromise the confidentiality of data and potentially lead to further attacks such as privilege escalation or remote code execution if attackers leverage other vulnerabilities. The integrity and availability of the affected systems could also be at risk if attackers modify included files or execute malicious scripts. Organizations relying on WordPress sites with this theme, especially those hosting sensitive or business-critical information, face increased risk of data breaches and operational disruption. The absence of authentication requirements and the ease of exploitation through crafted HTTP requests increase the threat level. Additionally, the widespread use of WordPress globally means that many organizations could be exposed, particularly those that do not regularly update or audit their themes and plugins.

To mitigate CVE-2026-28067, organizations should immediately audit their WordPress installations to identify if the ThemeREX Bassein theme is in use and determine the version. Until an official patch is released, administrators should implement strict input validation and sanitization on any parameters that control file inclusion to prevent manipulation. Employ web application firewalls (WAFs) with rules designed to detect and block attempts to exploit LFI vulnerabilities. Restrict file system permissions to limit the web server's access to sensitive files, minimizing the impact of any successful inclusion. Monitor web server logs and application logs for suspicious requests that attempt to manipulate include parameters. Consider temporarily disabling or replacing the vulnerable theme if feasible. Stay informed about updates from ThemeREX and apply patches promptly once available. Additionally, conduct regular security assessments and penetration testing focused on file inclusion and injection vulnerabilities to proactively identify and remediate weaknesses.