CVE-2026-88745 in Emlog-Pro
Summary
by MITRE • 09/21/2026
EMLOG-Pro 2.6.29 contains a XSS vulnerability that enables attackers to upload a malicious shell.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 09/21/2026
The reported security issue in EMLOG-Pro version 2.6.29 highlights a critical intersection between cross-site scripting and remote code execution, fundamentally undermining the integrity of the content management system. While the initial classification identifies this as an XSS vulnerability, the operational reality described indicates that the flaw allows for the upload of malicious shells, which represents a significantly more severe threat vector than typical client-side script injection. This discrepancy suggests that the application fails to properly sanitize or validate file uploads and subsequent execution contexts, allowing attackers to bypass standard security controls through crafted input that exploits weaknesses in how user-supplied data is handled during the upload process.
From a technical perspective, this vulnerability likely stems from insufficient validation of uploaded files combined with inadequate restrictions on executable content types within the web directory structure. In many CMS platforms, including EMLOG-Pro, there are often mechanisms for users to upload media or plugins that may inadvertently allow script execution if path traversal or extension filtering is misconfigured. The attacker leverages this weakness by injecting malicious code disguised as a legitimate file type or through an XSS payload that facilitates the delivery of a web shell. Once uploaded and executed on the server, this shell provides the adversary with direct command-line access to the underlying operating system, effectively granting full control over the compromised environment.
The operational impact of such a vulnerability is profound, extending far beyond simple defacement or session hijacking associated with traditional XSS attacks. With remote code execution capabilities established via the uploaded shell, an attacker can exfiltrate sensitive database contents, modify website files to create backdoors for persistent access, and potentially pivot into other systems within the internal network infrastructure. This level of compromise violates core security principles regarding confidentiality, integrity, and availability, as it allows unauthorized modification of critical application data and complete takeover of server resources without detection by standard perimeter defenses that may not monitor outbound shell communications or file system anomalies closely enough.
This incident aligns with CWE-79 for Improper Neutralization of Input During Web Page Generation, specifically when the input leads to arbitrary code execution rather than just script injection. Furthermore, it maps directly to MITRE ATT&CK technique T1505.003, known as Server Side Request Forgery or more accurately in this context, Web Shell deployment which falls under T1505 Series for Install Backdoor components. The ability to upload and execute arbitrary code is also consistent with CWE-434, Unrestricted Upload of File with Dangerous Type, indicating that the application does not adequately restrict file extensions or content types during the ingestion phase.
To mitigate this risk, immediate action must be taken by upgrading EMLOG-Pro to a patched version where these input validation and file upload restrictions have been addressed by the developers. In the interim, administrators should enforce strict allow-lists for permitted file uploads at both the application level and via web server configuration such as Nginx or Apache, ensuring that executable scripts cannot reside in directories designated for static media. Additionally, implementing Web Application Firewall rules to detect common shell signatures and monitoring server logs for unusual process executions can provide an additional layer of defense against exploitation attempts until a permanent fix is deployed.