CVE-2026-19383 in SaiAdmin
Summary
by MITRE • 08/10/2026
A security vulnerability has been detected in saithink/saigroup SaiAdmin up to 5.0.1. This impacts the function shell_exec of the file /app/saipackage/install/upload of the component Plugin Upload Endpoint. The manipulation leads to unrestricted upload. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. This product is published by multiple vendors.
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Analysis
by VulDB Data Team • 08/10/2026
This vulnerability resides within the SaiAdmin plugin upload endpoint functionality of the saithink/saigroup SaiAdmin application version 5.0.1 and earlier. The security flaw manifests through the shell_exec function implementation in the /app/saipackage/install/upload file, creating a critical pathway for unauthorized code execution. The issue stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file uploads, allowing malicious actors to bypass normal upload restrictions and execute arbitrary commands on the target system.
The technical exploitation occurs when an attacker submits a specially crafted file through the plugin upload interface without proper authorization checks. The shell_exec function processes this input directly without sufficient validation, enabling command injection attacks where attackers can execute system commands with the privileges of the web server process. This creates a severe privilege escalation vector that can be leveraged to gain full control over the affected system.
The operational impact extends beyond simple code execution to encompass complete system compromise and data exfiltration capabilities. Attackers can leverage this vulnerability to install backdoors, establish persistent access, perform lateral movement within networks, and potentially escalate privileges to root or administrator levels depending on the server configuration. The unrestricted upload capability means that attackers can deploy malicious payloads including web shells, malware, or other exploit frameworks without restriction.
This vulnerability directly maps to CWE-434 which addresses insecure file upload handling, and aligns with ATT&CK technique T1195.002 for Unsecured Credentials and T1059.007 for Command and Scripting Interpreter. The public disclosure of exploits increases the likelihood of automated attacks and makes this vulnerability particularly dangerous as threat actors can readily weaponize the known weakness without requiring advanced exploitation skills.
Security mitigations should prioritize immediate implementation of file type validation, restriction of executable file uploads, and proper input sanitization processes. Organizations must enforce strict file extension filtering, implement content-based file analysis, and apply principle of least privilege configurations to limit potential damage from successful exploitation attempts. Additionally, network segmentation, intrusion detection systems, and regular security audits should be deployed to monitor for suspicious upload activities and prevent unauthorized access to the vulnerable plugin endpoint.