CVE-2026-79423 in SeaCMS
Summary
by MITRE • 09/04/2026
An authenticated remote code execution (RCE) vulnerability in the admin_config.php component of seacms v13.6 allows attackers to execute arbitrary code via a crafted POST request.
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Analysis
by VulDB Data Team • 09/04/2026
The identified security flaw resides within the admin_config.php module of SeaCMS version 13.6, representing a critical authenticated remote code execution vulnerability. This specific weakness stems from insufficient input validation and sanitization mechanisms when processing configuration parameters submitted by administrators through HTTP POST requests. Because the vulnerability requires authentication, it typically impacts users who have already gained access to the administrative interface, often due to weak credentials, credential stuffing attacks, or session hijacking. However, once an attacker possesses valid administrative privileges, they can exploit this flaw to inject malicious code into system configuration files or execute commands directly on the underlying server operating system. The technical nature of this vulnerability aligns with CWE-94 Improper Control of Generation of Code (Code Injection), as it allows for the injection and subsequent execution of arbitrary scripts or commands within a context that has elevated privileges.
From an operational perspective, the impact of this vulnerability is severe, potentially leading to complete compromise of the web server hosting the SeaCMS instance. An attacker leveraging this flaw can achieve full control over the application environment, including reading sensitive data such as database credentials and user information, modifying website content, installing backdoors for persistent access, or using the compromised system as a pivot point for further attacks against internal network resources. This scenario is consistent with MITRE ATT&CK techniques related to Command and Scripting Interpreter abuse, specifically T1059 which covers execution of commands via various interpreters like PHP, Python, or Bash depending on the server configuration. The ability to execute arbitrary code effectively bypasses standard web application firewalls if they are not configured to inspect authenticated administrative traffic closely, making detection challenging without robust logging and monitoring solutions in place.
Mitigation strategies must focus primarily on restricting access to the administrative interface and hardening input handling procedures. Immediate remediation involves applying any available patches or updates provided by SeaCMS that address this specific flaw in version 13.6 or later releases. If patching is not immediately feasible, administrators should enforce strict network-level access controls such as IP whitelisting for all admin endpoints to ensure only trusted management stations can reach the administrative panel. Additionally implementing multi-factor authentication significantly reduces the risk of unauthorized administrative login attempts that could lead to exploitation of this vulnerability. Input validation must be rigorously enforced on all configuration parameters, ensuring that special characters and code execution payloads are strictly rejected or safely encoded before processing by the backend logic. Regular security audits and penetration testing focused on authenticated user roles are recommended to identify similar weaknesses in other components of the application ecosystem.