CVE-2025-9173 in Emlog Pro
Summary
by MITRE • 08/20/2025
A weakness has been identified in Emlog Pro up to 2.5.18. This issue affects some unknown processing of the file /admin/media.php?action=upload&sid=0. Executing manipulation of the argument File can lead to unrestricted upload. The attack may be launched remotely. The exploit has been made available to the public and could be exploited. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 07/18/2026
This vulnerability represents a critical file upload restriction bypass in Emlog Pro version 2.5.18 and earlier, specifically targeting the administrative media upload functionality. The flaw exists within the file processing logic at /admin/media.php?action=upload&sid=0 where improper input validation allows attackers to circumvent security controls designed to prevent arbitrary file uploads. The vulnerability stems from insufficient sanitization of the File argument parameter, which enables malicious actors to upload files with potentially harmful extensions or content that would normally be rejected by the system's file type filtering mechanisms. This weakness creates a direct pathway for remote code execution and system compromise through unrestricted file upload capabilities.
The technical implementation of this vulnerability allows attackers to manipulate the File argument parameter in the media.php script, bypassing the intended security measures that should restrict uploads to specific file types only. When an attacker successfully exploits this flaw, they can upload malicious files such as php shells, webshells, or other executable content directly to the server through the administrative interface. The attack vector is entirely remote, meaning no local system access or physical presence is required for exploitation, making it particularly dangerous in networked environments. This vulnerability aligns with CWE-434 Unrestricted Upload of File and follows patterns identified in ATT&CK technique T1190 Exploit Public-Facing Application, where attackers target web application interfaces to gain initial access.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it provides a potential foothold for more sophisticated attacks including privilege escalation, persistence mechanisms, and lateral movement within compromised networks. Once an attacker successfully uploads malicious content, they can execute arbitrary code on the server, potentially gaining full administrative control over the Emlog Pro installation and underlying system resources. The lack of vendor response to early disclosure attempts indicates a critical gap in security support for this software, leaving users exposed to potential exploitation without official patches or mitigations. Organizations running affected versions should immediately implement network-level restrictions, file type validation monitoring, and consider manual code review to identify and remove any malicious files that may have already been uploaded through this vulnerability.
The exploitation of this vulnerability demonstrates the importance of proper input validation and the principle of least privilege in web application security. Without adequate sanitization of user-supplied data during file upload operations, attackers can manipulate the upload process to bypass built-in security controls. This flaw highlights the necessity for comprehensive security testing including penetration testing and code review processes specifically targeting file handling functions within administrative interfaces. The availability of public exploit code further amplifies the risk, as it lowers the barrier to exploitation for threat actors with minimal technical expertise. Organizations should prioritize immediate remediation through patching or implementing compensating controls such as web application firewalls and mandatory file type validation at multiple layers of the system architecture to prevent unauthorized file uploads and maintain system integrity.