Crafty Controller Users API Insecure Direct Object Reference Vulnerability

An insecure direct object reference (IDOR) vulnerability has been identified in the Users API component of Crafty Controller. This flaw, designated as CVE-2026-5652, allows a remote, authenticated attacker to bypass authorization controls and perform unauthorized user modification actions. The vulnerability stems from improper API permissions validation, enabling malicious actors with valid credentials but insufficient privileges to manipulate user accounts beyond their authorized scope. This poses a significant risk to the confidentiality, integrity, and availability of the Crafty Controller system and its users. Successful exploitation could lead to privilege escalation, data breaches, and service disruption.

Attack Chain

1. An attacker authenticates to the Crafty Controller application with a low-privileged user account.
2. The attacker identifies the Users API endpoint responsible for user modification actions.
3. The attacker crafts a malicious API request, manipulating the user ID parameter to target a different user account than the one associated with their credentials.
4. The attacker sends the crafted API request to the Crafty Controller server.
5. Due to the insecure direct object reference vulnerability, the application fails to properly validate the attacker’s permissions against the target user account.
6. The application processes the request and modifies the target user account according to the attacker’s specifications.
7. The attacker successfully modifies user attributes like password, permissions, or other sensitive data of the targeted user.
8. The attacker escalates privileges by modifying another administrator account, granting themselves full access to the application.

Impact

Successful exploitation of CVE-2026-5652 allows an attacker to perform unauthorized user modifications, potentially leading to privilege escalation and complete control over the Crafty Controller application. The CVSS v3.1 base score of 9.0 reflects the critical severity of this vulnerability. The number of potential victims is directly correlated to the number of Crafty Controller installations. Depending on the scope of the system, the consequences may include data breaches, financial loss, and reputational damage.

Recommendation

• Apply available patches or updates from Crafty Controller to address CVE-2026-5652 as soon as possible.
• Implement robust authorization checks on the Users API to ensure that users can only modify their own accounts or accounts they are explicitly authorized to manage.
• Deploy the Sigma rule provided to detect suspicious user modification activity.
• Monitor API access logs for attempts to access or modify user accounts outside the user’s authorized scope.