CVE-2026-28052 is a Local File Inclusion (LFI) vulnerability found in the ThemeREX Peter Mason WordPress theme, affecting versions up to and including 1.4.5. The vulnerability arises due to improper control of the filename parameter used in PHP include or require statements, which allows an attacker to manipulate the input to include arbitrary files from the local filesystem. This can lead to unauthorized disclosure of sensitive files, such as configuration files containing credentials, or even remote code execution if combined with other vulnerabilities or writable files. The issue is intrinsic to the theme's PHP code that fails to properly sanitize or validate user-supplied input before including files. While no public exploits have been reported yet, the vulnerability is critical because LFI is a common and well-understood attack vector. The lack of a CVSS score indicates the vulnerability is newly published, and no official severity rating has been assigned. The vulnerability affects websites running the Peter Mason theme, which is used primarily in WordPress environments, a widely deployed CMS platform globally. The vulnerability was reserved and published in early 2026, with no patches or mitigations officially released at the time of reporting.

The potential impact of CVE-2026-28052 is significant for organizations using the vulnerable Peter Mason theme. Successful exploitation can lead to unauthorized access to sensitive server files, including configuration files, user data, or application source code, compromising confidentiality. Attackers may also execute arbitrary PHP code if they can include files with malicious content or combine this vulnerability with other weaknesses, impacting integrity and availability. This can result in website defacement, data breaches, or full server compromise. For organizations relying on affected WordPress sites for business operations, this could lead to reputational damage, financial loss, and regulatory penalties. Given the widespread use of WordPress and the popularity of third-party themes, the scope of affected systems could be broad, especially if the theme is used in high-traffic or critical websites. The absence of known exploits in the wild currently reduces immediate risk but does not diminish the urgency for remediation.

To mitigate CVE-2026-28052, organizations should first check for and apply any official patches or updates released by ThemeREX for the Peter Mason theme. If no patch is available, temporarily disabling or replacing the theme with a secure alternative is advisable. Implement strict input validation and sanitization on any parameters used in include or require statements to prevent malicious file path manipulation. Employ web application firewalls (WAFs) to detect and block suspicious requests attempting LFI attacks. Restrict file permissions on the server to limit access to sensitive files and prevent unauthorized file inclusion. Conduct regular security audits and code reviews of custom themes and plugins to identify similar vulnerabilities. Monitor web server logs for unusual access patterns indicative of LFI attempts. Additionally, ensure that PHP configurations disable dangerous functions and restrict file inclusion paths where possible.