CVE-2026-78310 in DIAEnergie
Summary
by MITRE • 09/24/2026
Authorization Bypass Through User-Controlled Key in DIAEnergie.
This issue affects DIAEnergie: before 1.11.00.022.
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Analysis
by VulDB Data Team • 09/24/2026
The vulnerability identified as an authorization bypass through user-controlled key within the DIAEnergie software represents a critical flaw in access control mechanisms, specifically affecting versions prior to release 1.11.00.022. This type of security defect typically arises when an application fails to properly validate or sanitize identifiers provided by users before using them to retrieve sensitive data or perform administrative actions. In the context of DIAEnergie, which is likely a platform for energy management or utility billing systems handling personally identifiable information and financial records, such a flaw allows attackers to manipulate internal object references to access resources belonging to other users or escalate privileges beyond their assigned role. The core technical issue lies in the application's reliance on predictable or directly exposed keys that are not adequately bound to the authenticated session context of the current user.
From a technical perspective, this vulnerability aligns with CWE-639, which describes Authorization Bypass Through User-Controlled Key. It often manifests as an Insecure Direct Object Reference (IDOR) where sequential identifiers such as customer IDs, invoice numbers, or account keys are used in API endpoints or web requests without sufficient server-side validation to ensure the requesting user owns that specific resource. An attacker can exploit this by intercepting network traffic and modifying these key parameters to point to different entities within the database. Since the application trusts the provided key without verifying its association with the authenticated identity, it returns sensitive data such as billing details, personal addresses, or payment history for arbitrary users. This bypasses standard authentication checks because the user is already logged in but lacks authorization for the specific target resource.
The operational impact of this vulnerability is severe due to the nature of the data processed by DIAEnergie systems. Successful exploitation can lead to a comprehensive breach of confidentiality, exposing sensitive customer information including names, addresses, social security numbers, and financial transaction histories. Beyond privacy violations, attackers could potentially manipulate billing records or account settings if additional write operations are exposed through similar endpoints. This undermines the integrity and availability aspects of the CIA triad as well, particularly in scenarios where malicious actors alter data to cause service disruptions or financial fraud. The lack of proper access control checks means that any authenticated user can theoretically enumerate valid keys and harvest vast amounts of private data, leading to significant regulatory penalties under frameworks like GDPR or HIPAA depending on the jurisdiction and data types involved.
This vulnerability is also closely mapped to MITRE ATT&CK technique T1078, specifically Valid Accounts, as it relies on legitimate credentials being used in an unauthorized manner to access restricted resources. Furthermore, it falls under the broader category of Broken Access Control (TA0004) within the ATT&CK framework, highlighting a failure in enforcing least privilege principles and proper separation of duties. The exploitation path typically involves reconnaissance followed by direct manipulation of request parameters, requiring no complex payload injection or buffer overflow techniques, making it highly accessible to attackers with basic knowledge of web application security testing tools like Burp Suite.
To mitigate this vulnerability, immediate action is required to upgrade DIAEnergie to version 1.11.00.022 or later where the flaw has been addressed by developers implementing robust access control checks. For organizations unable to patch immediately due to operational constraints, compensating controls should be implemented at the application layer and network perimeter. Application-level fixes include enforcing strict ownership verification for every data retrieval request, ensuring that server-side logic validates whether the authenticated user is authorized to access the requested resource ID before returning any data. Additionally, replacing sequential integer-based identifiers with unpredictable UUIDs can reduce the ease of enumeration attacks. Network-level mitigations involve deploying Web Application Firewalls configured to detect and block patterns indicative of parameter tampering or unauthorized object reference attempts. Regular security audits and penetration testing focusing on authorization logic are essential to ensure that similar flaws do not persist in other modules of the system.