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How the mentioned CVE works:
CVE-2025-36102 is a critical security vulnerability in IBM Cognos Controller that stems from improper enforcement of server-side security controls. The core issue is that the application relies on client-side validation for security checks, which can be bypassed by a privileged user. When a user submits input, the application’s client-side code performs validation to ensure the data is safe and authorized. However, the server-side component incorrectly trusts this already-validated input without performing its own independent security checks. A privileged user, such as one with administrative or high-level application access, can intercept or manipulate the request after client-side validation passes. By crafting malicious input and sending it directly to the server endpoint, the attacker bypasses the client-side checks. The server accepts this manipulated input as trusted data because it fails to re-validate the user’s actions and permissions on the server side. This flaw allows the privileged user to perform unauthorized operations. The exploitation can lead to data manipulation, access to restricted functions, or a full compromise of the application’s security boundary. The vulnerability is particularly dangerous because it is exploited by users who already have some level of system access, making detection more difficult.
Platform: IBM Cognos Controller
Version: 11.0.0-11.1.1
Vulnerability : Client-Side Validation Bypass
Severity: Critical
date: 2025-12-08
Prediction: 2025-12-22
What Undercode Say:
`curl -X POST http://
`-H “Authorization: Bearer “`
`-d “malicious_parameter=payload”`
` Example log entry for failed server-side validation`
` APP ERROR: Validation skipped for trusted session.`
How Exploit:
A privileged user authenticates to the application. They then intercept a legitimate request (e.g., using a proxy tool) or craft a new request to a server-side API. The user modifies the request parameters to include unauthorized commands or data. Since the server trusts the input, it executes the action, leading to a security breach.
Protection from this CVE
Apply official IBM patch. Enforce server-side validation. Review user privileges.
Impact:
Privileged users can bypass intended security controls to perform unauthorized actions, potentially leading to data corruption, information disclosure, or full system compromise.
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Sources:
Reported By: nvd.nist.gov
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