CVE-2026-4591 in kodbox
Summary
by MITRE • 03/23/2026
A weakness has been identified in kalcaddle kodbox 1.64. This affects the function checkBin of the file /workspace/source-code/plugins/fileThumb/app.php of the component fileThumb Endpoint. Executing a manipulation can lead to os command injection. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 03/28/2026
The vulnerability identified in kalcaddle kodbox version 1.64 represents a critical command injection flaw within the fileThumb plugin component. This weakness exists in the checkBin function located at /workspace/source-code/plugins/fileThumb/app.php, where improper input validation allows malicious actors to manipulate system commands through the fileThumb endpoint. The vulnerability's severity is amplified by its remote execution capability, meaning attackers can exploit this flaw without requiring physical access to the target system. The public availability of exploit code significantly increases the risk surface, as it lowers the barrier to entry for potential attackers who may not possess advanced technical skills to develop custom exploits. This type of vulnerability falls under the Common Weakness Enumeration category CWE-77, which specifically addresses command injection vulnerabilities that occur when untrusted data is incorporated into system commands without proper sanitization or validation.
The technical implementation of this flaw demonstrates a classic lack of input sanitization where user-supplied parameters are directly incorporated into operating system command execution contexts. When the checkBin function processes input through the fileThumb endpoint, it fails to properly validate or escape special characters that could alter the intended command execution flow. This allows attackers to inject malicious commands that get executed with the privileges of the web application process, potentially leading to complete system compromise. The vulnerability's remote exploitability means that attackers can leverage this flaw through standard network connections, making it particularly dangerous in publicly accessible environments. The lack of vendor response despite early disclosure indicates a potential security gap in the software supply chain, leaving users exposed to active exploitation without official patches or mitigations.
The operational impact of this vulnerability extends beyond simple command execution, potentially enabling attackers to escalate privileges, access sensitive data, or establish persistent backdoors within affected systems. The fileThumb plugin's functionality suggests it may handle file operations, making it a prime target for attackers seeking to manipulate system files or execute arbitrary code. Given the nature of command injection vulnerabilities, attackers could potentially leverage this flaw to perform reconnaissance activities, deploy malware, or use the compromised system as a pivot point for attacking other networked systems. The vulnerability's presence in a widely used content management system or file management application creates significant risk for organizations that rely on kodbox for their file handling operations, as it could provide attackers with unauthorized access to critical system resources and data.
Mitigation strategies for this vulnerability should include immediate implementation of input validation and sanitization measures within the affected component, followed by vendor coordination for patch development and deployment. Organizations should consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts. The implementation of web application firewalls and security monitoring systems can help detect and prevent exploitation attempts. Additionally, administrators should conduct comprehensive security assessments of their kodbox installations to identify similar vulnerabilities in other components or plugins. The lack of vendor response underscores the importance of maintaining alternative security measures and considering vendor independence strategies for critical applications. This vulnerability highlights the necessity of proactive security measures and the importance of maintaining up-to-date security practices even when vendors do not respond promptly to security disclosures, as outlined in the MITRE ATT&CK framework's command and control tactics.