CVE-2025-67436 in PluXml
Summary
by MITRE • 12/23/2025
Authenticated Remote Code Execution (RCE) in PluXml CMS 5.8.22 allows an attacker with administrator panel access to inject a malicious PHP webshell into a theme file (e.g., home.php).
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Analysis
by VulDB Data Team • 12/25/2025
CVE-2025-67436 represents a critical authenticated remote code execution vulnerability affecting PluXml CMS version 5.8.22 that enables attackers with administrative privileges to execute arbitrary code on the target system. This vulnerability stems from insufficient input validation and sanitization mechanisms within the theme file upload and modification functionality, specifically targeting the home.php file and similar theme components. The flaw allows authenticated attackers to inject malicious PHP code directly into theme files, effectively creating a persistent backdoor that can be leveraged for further system compromise and data exfiltration.
The technical implementation of this vulnerability aligns with CWE-94, which describes inadequate validation of dangerous or unexpected data in interpreted code execution contexts. Attackers exploiting this vulnerability can leverage their administrative access to navigate to the theme editor interface and inject webshell code into theme files, bypassing normal security controls. The vulnerability exists because the CMS does not properly validate or sanitize user-supplied content before rendering it as executable PHP code within the theme context. This represents a classic code injection flaw that operates at the application layer, allowing attackers to execute arbitrary commands with the privileges of the web server process.
The operational impact of CVE-2025-67436 extends far beyond simple code execution, as it provides attackers with persistent access to compromised systems and enables a wide range of malicious activities including data theft, lateral movement, and establishment of command and control infrastructure. Once a webshell is injected, attackers can maintain long-term access to the system, upload additional malware, scan internal networks, and exfiltrate sensitive data without detection. This vulnerability directly maps to several ATT&CK techniques including T1059 for command and script injection, T1566 for phishing with malicious attachments, and T1078 for valid accounts. The attack chain typically begins with credential compromise or social engineering to gain administrative access, followed by exploitation of this vulnerability to establish persistent access.
Organizations should implement immediate mitigations including applying the vendor-provided security patches, implementing strict access controls and least privilege principles, monitoring for unauthorized theme modifications, and conducting regular security assessments of web applications. Additional defensive measures should include web application firewalls with custom rules to detect suspicious PHP code patterns, regular file integrity monitoring to identify unauthorized theme modifications, and implementing multi-factor authentication for administrative accounts. The vulnerability also highlights the importance of secure coding practices and input validation, particularly when dealing with user-supplied content that gets executed as code. Security teams should conduct comprehensive penetration testing to identify similar vulnerabilities in other applications and ensure proper security controls are in place to prevent unauthorized access to administrative interfaces.