Description

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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.7",
  "pubDate": "2026-08-10T02:16:43.910Z",
  "pubdate": "2026-08-10T02:16:43.910Z",
  "executiveSummary": "An unrestricted file upload vulnerability has been identified in saithink/saigroup SaiAdmin up to version 5.0.1, specifically residing within the Plugin Upload Endpoint component handling file ingestion at the file path /app/saipackage/install/upload.\nThis security flaw enables remote attackers to bypass validation mechanisms and upload arbitrary files to the underlying server infrastructure.\nThe vulnerability directly impacts the execution context of the application by leveraging the vulnerable function shell_exec, permitting remote code execution without requiring prior authentication depending on endpoint exposure.\nThe risk implications are severe, as successful exploitation grants malicious actors the ability to execute arbitrary system commands, compromise the host operating system, pivot deeper into internal networks, exfiltrate sensitive data, or cause complete denial of service.\nPublic disclosure of the exploit increases the likelihood of opportunistic attacks targeting instances running vulnerable versions of the product.\nImmediate patching or restriction of the affected endpoint is critical to mitigate potential compromise.",
  "technicalDetails": "The vulnerability exists within the SaiAdmin software package up to version 5.0.1, specifically affecting the Plugin Upload Endpoint component located at the file path /app/saipackage/install/upload.\nThe root cause of the vulnerability stems from inadequate input validation, type checking, and filename sanitization routines during the processing of uploaded files.\nBecause the application fails to adequately restrict the types of files accepted or verify their contents against a strict whitelist of safe formats, an attacker can supply malicious payloads disguised as valid plugin packages or directly inject executable code.\nDuring the handling of the upload request, the application interacts with the underlying operating system environment, utilizing the vulnerable function shell_exec to process or unpack the received data.\nDue to insufficient command argument sanitization and improper handling of user-supplied input prior to execution within shell_exec, the application passes malicious payloads directly to the system shell.\nThe step-wise attack flow begins with a remote attacker identifying the exposed upload endpoint at /app/saipackage/install/upload.\nThe attacker crafts a malicious HTTP multipart request containing a specially engineered payload designed to leverage the shell_exec function execution sink.\nUpon submission, the application accepts the upload without enforcing robust validation checks, storing or processing the payload in a manner that triggers the vulnerable function.\nThe execution of shell_exec parses and runs the attacker-controlled input within the context of the web server process, leading to immediate remote code execution on the host system.\nDepending on the privilege level of the web server daemon, the post-exploitation impact includes full system compromise, deployment of web shells, persistent backdoors, lateral movement within the network, and complete loss of confidentiality, integrity, and availability of the affected system."
}