CVE-2025-66385: Cerebrate Privilege Escalation Vulnerability

CVE-2025-66385 Overview

CVE-2025-66385 is a critical privilege escalation vulnerability in Cerebrate, an open-source platform for sharing and synchronizing threat intelligence. The vulnerability exists in the UsersController::edit function in versions prior to 1.30, allowing authenticated non-privileged users to escalate their privileges to higher roles, including administrator, by manipulating the role_id or organisation_id fields in user-edit requests.

Critical Impact

An authenticated low-privilege user can gain administrative access to the Cerebrate platform, potentially compromising the entire threat intelligence sharing infrastructure and all connected organizations.

Affected Products

• Cerebrate versions prior to 1.30
• Cerebrate v1.29 and earlier releases
• Organizations using Cerebrate for threat intelligence sharing

Discovery Timeline

• 2025-11-28 - CVE-2025-66385 published to NVD
• 2025-12-01 - Last updated in NVD database

Technical Details for CVE-2025-66385

Vulnerability Analysis

This vulnerability is classified under CWE-472 (External Control of Assumed-Immutable Web Parameter). The UsersController::edit endpoint in Cerebrate fails to properly validate and restrict which user profile fields can be modified during an edit operation. When a user submits a request to the user-edit endpoint, the application does not adequately verify that the requesting user has authorization to modify sensitive fields like role_id and organisation_id.

The vulnerability allows any authenticated user, regardless of their current privilege level, to inject or modify these critical fields in the edit request payload. Since role assignments directly control access permissions within Cerebrate, successfully exploiting this flaw grants the attacker elevated privileges equivalent to whichever role ID they specify—including full administrative access.

Root Cause

The root cause of this vulnerability stems from insufficient server-side validation of user-controllable input parameters in the UsersController::edit function. The application accepts and processes role_id and organisation_id parameters from user requests without verifying whether the authenticated user has authorization to modify these sensitive fields. This represents a classic Insecure Direct Object Reference (IDOR) combined with improper access control, where the application trusts client-supplied data for security-critical operations.

Attack Vector

The attack is network-based and requires authentication to the Cerebrate platform. An attacker with a valid low-privilege account can craft a malicious HTTP request to the user-edit endpoint, including the role_id parameter set to a privileged role (such as an administrator role ID). The application processes this request without proper authorization checks, resulting in the attacker's account being elevated to the specified role.

The exploitation is straightforward and does not require any user interaction or special conditions beyond network access to the Cerebrate instance and valid authentication credentials. Once the attacker modifies their role to an administrative level, they gain full control over the Cerebrate platform, including access to sensitive threat intelligence data, user management capabilities, and configuration settings.

Detection Methods for CVE-2025-66385

Indicators of Compromise

• Unexpected changes to user role_id or organisation_id fields in Cerebrate user records
• Audit logs showing user-edit operations that modify role assignments by non-administrative users
• Sudden privilege elevation of previously low-privilege accounts
• HTTP requests to the user-edit endpoint containing role_id or organisation_id parameters from non-admin sessions

Detection Strategies

• Monitor Cerebrate audit logs for any user-edit operations that result in role changes
• Implement alerting on POST/PUT requests to the user-edit endpoint that contain role_id or organisation_id parameters
• Review user role assignments periodically for unauthorized changes
• Deploy web application firewall (WAF) rules to flag suspicious parameter injection attempts

Monitoring Recommendations

• Enable comprehensive audit logging in Cerebrate to capture all user modification events
• Configure SIEM alerts for privilege escalation patterns in Cerebrate logs
• Implement periodic user role audits to detect unauthorized elevation
• Monitor network traffic to Cerebrate instances for anomalous API requests targeting user management endpoints

How to Mitigate CVE-2025-66385

Immediate Actions Required

• Upgrade Cerebrate to version 1.30 or later immediately
• Audit all user accounts to identify any unauthorized privilege escalations
• Review recent user-edit operations in audit logs for suspicious activity
• Consider temporarily restricting user self-edit capabilities until the patch is applied

Patch Information

The vulnerability has been addressed in Cerebrate version 1.30. The fix is available in commit c9bfa90abc85d4a20a9cc2f282959b72bef829bb. Organizations can review the complete changes between vulnerable and patched versions via the GitHub version comparison for v1.29 to v1.30. Additional vulnerability details are available in the CIRCL Vulnerability Report.

Workarounds

• Implement network-level access controls to restrict access to the Cerebrate instance to trusted networks only
• Deploy a web application firewall (WAF) with rules to block requests containing role_id or organisation_id parameters from non-administrative sessions
• Disable or restrict the user-edit functionality until the patch can be applied
• Implement additional authentication layers (MFA) to reduce the risk of compromised accounts being used for exploitation