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CVE-2025-6741: Unauthorized Entry Access via Secure Message Entry Attachment Feature in Devolutions Server

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Overview

This report discusses a serious vulnerability in Devolutions Server, designated as CVE-2025-6741. This vulnerability, if exploited, can compromise data and system integrity by allowing unauthorized access to sensitive information via the secure message entry attachment feature. The vulnerability impacts both businesses and individual users utilizing affected versions of Devolutions Server, underscoring the urgency of its mitigation.

Vulnerability Summary

CVE ID: CVE-2025-6741
Severity: High (7.7 CVSS Score)
Attack Vector: Network
Privileges Required: Low (Authenticated User)
User Interaction: Required
Impact: Unauthorized access to sensitive data, potential system compromise

Affected Products

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Product | Affected Versions

Devolutions Server | 2025.2.2.0 through 2025.2.4.0
Devolutions Server | 2025.1.11.0 and earlier

How the Exploit Works

The vulnerability arises from an improper access control mechanism in the secure message component of Devolutions Server. An authenticated user could exploit this vulnerability by sending a specially crafted request to the secure message entry attachment feature. By doing so, they could gain unauthorized access to sensitive data, leading to potential system compromise or data leakage.

Conceptual Example Code

POST /secure_message/attachment_entry HTTP/1.1
Host: target.example.com
Authorization: Bearer {user_token}
{
"entry_id": "{unauthorized_entry_id}",
"attachment_data": "{malicious_payload}"
}

In this conceptual example, an authenticated user sends a POST request to the `attachment_entry` endpoint of the `secure_message` component. The user includes an `entry_id` for an entry to which they do not have legitimate access, and `attachment_data` that represents a malicious payload. This unauthorized action is made possible due to the improper access control mechanism in place.

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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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