Description

Unauthenticated Arbitrary File Upload in Type Hub <= 2.0.6 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "10.0",
  "pubDate": "2026-08-06T15:17:21.227Z",
  "pubdate": "2026-08-06T15:17:21.227Z",
  "executiveSummary": "An unauthenticated arbitrary file upload vulnerability has been identified in Type Hub versions <= 2.0.6. This security flaw allows remote, unauthenticated threat actors to upload arbitrary files directly to the underlying web server hosting the vulnerable application.\nThe primary impact of this vulnerability includes potential remote code execution, system compromise, and full infrastructure takeover if malicious payloads such as web shells are successfully uploaded and executed.\nThe vulnerability affects all Type Hub installations running version 2.0.6 or earlier. Exploitation requires network access to the target application and does not necessitate any prior authentication or privileged access credentials.\nThe root cause stems from improper input validation and insufficient restriction of file upload functionalities, enabling attackers to bypass intended security controls. Given the absence of authentication requirements and the severe impact, the risk implications are critical, demanding immediate remediation to prevent exploitation.",
  "technicalDetails": "The vulnerability resides within the file upload mechanism of the Type Hub application, specifically affecting versions <= 2.0.6. The root cause of the flaw is the lack of stringent validation and sanitization checks on uploaded files, coupled with insufficient enforcement of file type restrictions and extension whitelisting.\nBecause the vulnerable component lacks proper authentication and authorization controls, the file upload functionality is exposed to unauthenticated users over the network. An attacker can interact directly with the endpoint responsible for handling file uploads without needing to supply valid session tokens or credentials.\nThe attack flow proceeds as follows: First, the remote attacker crafts a malicious payload, typically a web shell written in a server-side scripting language such as PHP or JavaScript, disguised or permitted by the inadequate validation logic. Second, the attacker sends an HTTP POST request containing the multipart form-data payload to the vulnerable file upload endpoint of the Type Hub application.\nThird, the application processes the request and stores the malicious file within the web root or an accessible directory on the server file system without properly verifying its content or renaming it securely. Finally, the attacker navigates directly to the uploaded file's URL via the browser or an automated tool, triggering execution of the embedded script within the context of the web server process.\nPost-exploitation impact includes full remote code execution (RCE) on the host operating system, unauthorized access to sensitive application data, database compromise, pivoting within the internal network, and deployment of secondary payloads such as ransomware or persistent backdoors. Network exposure is broad, as the application must typically be reachable via HTTP or HTTPS to function."
}