Description

Subscriber Arbitrary File Upload in Smart Cleaning <= 4.8.6 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.9",
  "pubDate": "2026-08-20T12:16:37.317Z",
  "pubdate": "2026-08-20T12:16:37.317Z",
  "executiveSummary": "A subscriber-level arbitrary file upload vulnerability has been identified in Smart Cleaning versions <= 4.8.6. This security flaw enables authenticated users with subscriber-level privileges to upload arbitrary files to the underlying server hosting the vulnerable application. The vulnerability poses significant risk implications, potentially leading to remote code execution, server compromise, or unauthorized system access if malicious payloads, such as executable scripts, are successfully uploaded and processed by the web server. Attackers possessing standard subscriber accounts can exploit this flaw without requiring elevated privileges. The exploitation process involves leveraging improper input validation and insufficient file type restrictions within the file upload functionality exposed to low-privileged users. Remediation requires updating the Smart Cleaning product to a patched version beyond 4.8.6 or applying strict server-side validation controls on all file upload mechanisms to restrict permitted file extensions, enforce rigorous MIME-type checking, and store uploaded assets outside of the web root directory.",
  "technicalDetails": "The vulnerability resides within the file upload component of Smart Cleaning <= 4.8.6, specifically stemming from inadequate input validation, missing file type verification, and improper access control enforcement. While the functionality is accessible to accounts with subscriber privileges, the underlying code fails to adequately restrict the types of files that can be uploaded or verify that uploaded payloads conform to safe, expected formats.\nDuring a typical attack flow, an authenticated attacker possessing subscriber-level credentials interacts with the vulnerable file upload interface. The attacker crafts an HTTP request containing a malicious payload, such as a web shell or executable script, disguised or submitted directly through the vulnerable parameter. Because the application lacks robust server-side validation routines—such as cryptographic file renaming, whitelist-based extension filtering, and comprehensive MIME-type inspection—the server accepts the multipart/form-data payload and writes the arbitrary file to a publicly accessible directory within the web root.\nOnce the file is successfully uploaded, the attacker can execute the post-exploitation payload by directly navigating to the file path via standard HTTP requests. This results in arbitrary code execution under the privileges of the web server process, potentially allowing the attacker to read sensitive system files, interact with the underlying operating system, pivot to internal network resources, or fully compromise the integrity and availability of the host system."
}