CVE-2026-76143 in Genian SSL PNS
Summary
by MITRE • 10/01/2026
A missing authorization vulnerability in Genian SSL PNS allows an attacker to bypass multi-factor authentication by manipulating a login request parameter.
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Analysis
by VulDB Data Team • 10/01/2026
The identified vulnerability represents a critical security flaw within the Genian Secure Network Access (SNA) platform, specifically affecting its Single Sign-On and Multi-Factor Authentication mechanisms. This issue stems from improper access control implementation on specific API endpoints or internal service interfaces that handle authentication requests. In a properly secured system, every request to verify user credentials must be rigorously validated against the current session state and authorization policies before processing any login logic. However, in this instance, the application fails to enforce mandatory checks for multi-factor authentication (MFA) tokens when certain parameters are manipulated by an attacker. This architectural oversight allows a malicious actor to bypass the secondary layer of security that is designed to protect sensitive network resources from unauthorized access attempts.
From a technical perspective, the vulnerability likely involves the manipulation of request parameters such as session identifiers, token flags, or authentication state variables during the login handshake process. By altering these values, an attacker can trick the backend verification service into believing that multi-factor authentication has already been successfully completed or is not required for the specific transaction. This type of flaw is characteristic of broken access control issues where the server trusts client-supplied data regarding security states without independent validation on the server side. The absence of robust input validation and state management allows the attacker to skip the step requiring a second factor, such as an OTP code or hardware token verification, thereby reducing the authentication process to a simple username and password check if those credentials are known or compromised through other means like phishing or credential stuffing attacks.
The operational impact of this vulnerability is severe, particularly for organizations relying on Genian SNA for secure remote access to internal corporate networks. Successful exploitation enables an attacker with valid user credentials to gain unauthorized administrative or standard user access without possessing the required second factor. This effectively neutralizes one of the most effective defenses against credential-based attacks. If an attacker obtains a user's password through social engineering, data breaches, or keylogging, they can immediately pivot into the internal network environment. Once inside, the attacker may escalate privileges, exfiltrate sensitive data, install malware, or move laterally to compromise additional systems. The risk is amplified in environments where privileged accounts are managed through this platform, as it could lead to full domain compromise and significant regulatory non-compliance under standards such as GDPR, HIPAA, or PCI DSS which mandate strong authentication controls for accessing protected data.
This vulnerability aligns with CWE-287, Improper Authentication, specifically relating to the failure to verify multi-factor requirements during the login process. It also maps directly to MITRE ATT&CK technique T1078, Valid Accounts, as it facilitates unauthorized access using legitimate credentials while bypassing additional verification steps. Furthermore, it reflects aspects of CWE-345, Insufficient Verification of Data Authenticity, where the system fails to ensure that the authentication state is genuine and not forged by client-side manipulation. To mitigate this risk, immediate patching to the latest version of Genian SNA provided by the vendor is essential as it likely contains fixes for these access control checks. In the interim, network segmentation should be reviewed to limit lateral movement in case of a breach, and strict monitoring of authentication logs for anomalies such as successful logins lacking MFA tokens or unusual geographic locations can help detect exploitation attempts. Additionally, enforcing conditional access policies that require device compliance alongside identity verification adds another layer of defense against this specific bypass technique.