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CVE-2025-4433: Improper Access Control Leads to Privilege Escalation in Devolutions Server

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Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a significant security flaw in Devolutions Server versions 2025.1.7.0 and earlier. This vulnerability, tagged as CVE-2025-4433, is a glaring example of improper access control within user group management, allowing potential privilege escalation by non-admin users. This flaw is particularly concerning as it affects a broad range of systems and can lead to serious consequences like system compromise or data leakage if exploited.
The criticality of this vulnerability is underscored by its CVSS Severity Score of 8.8, indicating a high level of risk. Organizations running affected versions of Devolutions Server must prioritize addressing this issue to prevent potential security breaches.

Vulnerability Summary

CVE ID: CVE-2025-4433
Severity: High (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: System compromise or data leakage

Affected Products

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Product | Affected Versions

Devolutions Server | 2025.1.7.0 and earlier

How the Exploit Works

The CVE-2025-4433 vulnerability arises from improper access control within Devolutions Server’s user group management feature. Specifically, a non-administrative user with both “User Management” and “User Group Management” permissions can exploit this flaw to escalate their privileges. They can add themselves or other users to groups with administrative privileges, thereby gaining unauthorized access to administrative functions and sensitive data.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This pseudocode represents a malicious user adding themselves to an administrative group.

POST /api/usergroup/add HTTP/1.1
Host: devolutions-server.example.com
Content-Type: application/json
{
"userID": "malicious_user_id",
"groupID": "admin_group_id"
}

This request would add the malicious user to the admin group, granting them administrative rights and enabling them to potentially compromise the system or leak sensitive data.
To mitigate this vulnerability, it is highly recommended that organizations apply the vendor patch as soon as it becomes available. In the meantime, using Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation strategy.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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