CVE-2025-55835 in SueamCMS
Summary
by MITRE • 09/12/2025
File Upload vulnerability in SueamCMS v.0.1.2 allows a remote attacker to execute arbitrary code via the lack of filtering.
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Analysis
by VulDB Data Team • 09/12/2025
The CVE-2025-55835 vulnerability represents a critical file upload flaw in SueamCMS version 0.1.2 that exposes systems to remote code execution attacks. This vulnerability stems from insufficient input validation and filtering mechanisms within the content management system's file upload functionality. The absence of proper sanitization allows malicious actors to upload potentially harmful files that can be executed on the target server, creating a severe security risk for organizations relying on this platform. The vulnerability specifically targets the lack of file type validation and content inspection, enabling attackers to bypass security controls and deploy malicious payloads.
From a technical perspective, the flaw manifests as a failure to implement adequate file validation checks during the upload process. The system does not properly verify file extensions, MIME types, or file contents, creating an attack surface where adversaries can upload scripts or binary files that execute with the privileges of the web server. This vulnerability aligns with CWE-434 which describes insecure file upload vulnerabilities where applications accept files without proper validation, and it maps to ATT&CK technique T1190 which covers exploits for execution through malicious file uploads. The underlying technical issue demonstrates poor input sanitization practices and inadequate security controls at the application layer.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with persistent access to compromised systems. Once an attacker successfully uploads and executes malicious code, they can establish backdoors, escalate privileges, and potentially move laterally within the network. The vulnerability affects the entire application stack, as the CMS serves as a central point for content management and user interaction. Organizations using SueamCMS v.0.1.2 face significant risk of data breaches, system compromise, and potential regulatory violations due to the exposed attack surface. The vulnerability also impacts business continuity and trust, as unauthorized access can lead to complete system compromise and data exfiltration.
Mitigation strategies for CVE-2025-55835 require immediate implementation of multiple defensive measures. Organizations should implement strict file type validation using allowlists rather than blocklists, enforce proper MIME type checking, and conduct content inspection of uploaded files. The system should employ file extension validation, directory restrictions for uploads, and proper file naming conventions to prevent execution of uploaded files. Security controls should include web application firewalls that can detect and block suspicious upload attempts, regular security audits of file upload functionality, and implementation of principle of least privilege for upload directories. Additionally, organizations should consider deploying intrusion detection systems to monitor for anomalous file upload activities and ensure all systems are updated with the latest security patches. The remediation process should include comprehensive testing of upload functionality to verify that all security controls are properly implemented and functioning as intended.