Description

IBM Aspera Faspex 5.0.0 through 5.0.19 could allow an authorized user to craft a specific message to bypass user authorization and gain full administrative privileges.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-11-07T04:17:28.900Z",
  "pubdate": "2026-11-07T04:17:28.900Z",
  "executiveSummary": "IBM Aspera Faspex 5.0.0 through 5.0.19 contains a critical authorization bypass vulnerability that allows an authenticated user to gain full administrative privileges. This vulnerability constitutes an improper access control flaw, enabling a low-privileged user to elevate their account permissions to the highest level of system authority. The security impact is severe, as successful exploitation results in complete compromise of the application, including the ability to manage users, configure system settings, and access sensitive file transfer data. The vulnerability requires the attacker to hold an existing, authorized account on the target system. Given the nature of the exploit, which involves crafting specific messages to bypass internal authorization checks, the threat level is elevated for any deployment where untrusted users are granted legitimate access. Organizations are advised that this flaw undermines the entire trust model of the IBM Aspera Faspex platform, necessitating immediate attention to patching or limiting access until remediation is applied.",
  "technicalDetails": "The vulnerability in IBM Aspera Faspex 5.0.0 through 5.0.19 stems from insufficient validation of user-supplied input within the message processing or authorization module. In the affected versions, the application fails to properly enforce access control mechanisms when processing specific, crafted messages sent by an authorized user. This improper validation allows an attacker to manipulate the request flow to bypass the authorization boundary that governs administrative access.\nThe exploitation process initiates with a standard authorized user session. By identifying the specific API endpoints or communication channels utilized for administrative tasks, the attacker crafts a malicious request—typically by altering message parameters or payloads that the server incorrectly treats as originating from a trusted administrative context. Since the underlying system fails to verify if the user's current session claims are cryptographically or logically bound to the administrative privileges requested, the server processes the request as legitimate.\nSpecifically, the root cause involves a failure in the application’s business logic to verify the identity and permissions of the user performing sensitive administrative operations. The vulnerability exists within the logic handling, where authorization checks can be circumvented if the message structure adheres to an expected internal format that the system logic trusts implicitly. When the server parses this maliciously crafted message, it erroneously transitions the user's session state to one with elevated administrative rights.\nThe attack flow follows a structured path: first, the adversary authenticates as a standard user; second, they identify the targeted administrative function; third, they transmit a specifically crafted message designed to trigger the authorization bypass; fourth, the backend processes this request, failing to perform the necessary authorization validation; and finally, the application grants the user full administrative access. Post-exploitation impact includes the potential for unauthorized data exfiltration, the addition of rogue administrative accounts, the alteration of system-wide configurations, and the bypass of organizational security policies regarding file transfer visibility. Because this occurs via a legitimate channel, detection through standard signature-based network intrusion systems may be difficult, making this a critical concern for secure file transfer environments."
}