CVE-2025-36040 Overview
CVE-2025-36040 affects IBM Aspera Faspex versions 5.0.0 through 5.0.12.1. The flaw stems from client-side enforcement of server-side security mechanisms. An authenticated user can bypass these client-side controls and perform unauthorized actions against the application. IBM Aspera Faspex is a managed file transfer product used for high-speed data exchange across organizations.
The weakness is categorized under CWE-613, Insufficient Session Expiration. The vulnerability requires network access and low-privilege authentication, with no user interaction needed. It impacts integrity but does not affect confidentiality or availability.
Critical Impact
Authenticated attackers can bypass client-side security checks in IBM Aspera Faspex 5.0.0 through 5.0.12.1 to perform unauthorized actions that alter application data integrity.
Affected Products
- IBM Aspera Faspex 5.0.0
- IBM Aspera Faspex 5.0.1 through 5.0.12
- IBM Aspera Faspex 5.0.12.1
Discovery Timeline
- 2025-07-31 - CVE-2025-36040 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-36040
Vulnerability Analysis
IBM Aspera Faspex is a web-based managed file transfer platform. The product relies on client-side enforcement to restrict certain actions available to authenticated users. The server does not independently validate authorization or session state for the affected operations.
An authenticated attacker can modify requests sent from the browser or craft direct API calls to bypass the client-side restrictions. Because the server trusts the client to enforce the rules, these manipulated requests are processed as legitimate. The attacker can then perform unauthorized actions tied to integrity, such as modifying data or state that the application UI would normally block.
The affected version range covers IBM Aspera Faspex 5.0.0 through 5.0.12.1. The CWE-613 classification indicates the root cause relates to insufficient session expiration or session-based access controls on the server side.
Root Cause
The root cause is a design flaw: security decisions enforced only in the client. Any user who authenticates to Faspex has sufficient control over their own HTTP traffic to remove or alter these restrictions. The server should re-check authorization and session validity for each privileged action, but does not.
Attack Vector
Exploitation requires network access to the Faspex web interface and a valid low-privilege account. The attacker intercepts or crafts requests using a web proxy or HTTP client. By replaying requests with modified parameters or endpoints, the attacker triggers actions that the client UI prevents. No social engineering or user interaction is required.
See the IBM Support Page for vendor technical details.
Detection Methods for CVE-2025-36040
Indicators of Compromise
- Unexpected state or configuration changes in Faspex performed by low-privilege user accounts.
- Authenticated API requests to Faspex endpoints that do not correspond to normal UI-driven workflows.
- Repeated requests from the same session to endpoints associated with privileged actions.
Detection Strategies
- Review Faspex access logs for authenticated users invoking endpoints outside their expected role.
- Correlate web server logs with user role assignments to identify authorization anomalies.
- Deploy web application firewall rules that baseline expected request patterns per user role.
Monitoring Recommendations
- Forward Faspex and reverse proxy logs to a centralized SIEM for authenticated-user behavior analysis.
- Alert on administrative or state-changing operations performed by non-administrative accounts.
- Track session durations and token reuse patterns to identify sessions that outlive expected limits.
How to Mitigate CVE-2025-36040
Immediate Actions Required
- Upgrade IBM Aspera Faspex to the fixed version identified in the IBM Support Page.
- Audit existing Faspex user accounts and revoke access for users who no longer require it.
- Review recent Faspex activity logs for unauthorized actions performed by authenticated users.
Patch Information
IBM has published remediation guidance in the vendor advisory at the IBM Support Page. Administrators running IBM Aspera Faspex 5.0.0 through 5.0.12.1 should apply the fixed release referenced in that advisory.
Workarounds
- Restrict network access to the Faspex web interface to trusted networks and VPN users only.
- Enforce short session lifetimes and require re-authentication for privileged operations where configurable.
- Monitor and rate-limit authenticated API calls to Faspex endpoints at the reverse proxy layer.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.