CVE-2026-17070 in Liman MYS
Summary
by MITRE • 08/04/2026
Missing Authorization vulnerability in HAVELSAN Inc. Liman MYS allows Accessing Functionality Not Properly Constrained by ACLs.
This issue affects Liman MYS: from 2.2.3 before 2.3.1.
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Analysis
by VulDB Data Team • 08/04/2026
The vulnerability under discussion represents a critical missing authorization flaw within HAVELSAN Inc.'s Liman MYS software platform, specifically impacting versions ranging from 2.2.3 through the vulnerable state preceding version 2.3.1. This weakness fundamentally undermines the access control mechanisms that should govern user permissions and system functionality within the application. The issue manifests as a failure in properly constraining access to various application functions through inadequate access control lists, allowing unauthorized users to potentially exploit privileged capabilities that should remain restricted to authorized personnel only.
This technical deficiency falls squarely within the scope of CWE-285, which categorizes improper authorization vulnerabilities that occur when applications fail to properly verify whether authenticated users have sufficient privileges to perform requested operations. The vulnerability operates at the application layer where user authentication occurs but fails to maintain proper authorization checks during function execution, creating a pathway for privilege escalation attacks. When users successfully authenticate to the system, they may still be able to access functions and data that should require elevated permissions or specific role-based access controls.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data breaches, system compromise, and complete denial of service scenarios. Attackers exploiting this weakness can bypass the intended access control policies that normally prevent users from executing administrative functions, viewing restricted information, or modifying critical system parameters. This flaw directly violates the principle of least privilege that should govern all system components, allowing attackers to assume roles and perform actions that should be restricted to specific user groups or administrative personnel.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and legitimate credentials for unauthorized access. The attack surface is particularly concerning as it allows adversaries to leverage legitimate authentication mechanisms while bypassing authorization checks, making detection more challenging. Security professionals should consider this vulnerability as part of broader reconnaissance activities where attackers first establish presence within the system before attempting privilege escalation. The affected version range suggests that organizations running Liman MYS versions between 2.2.3 and 2.3.0 must urgently assess their access control configurations and implement proper authorization controls.
Mitigation strategies should focus on implementing comprehensive access control mechanisms including role-based access control systems, mandatory access controls, and regular access reviews of all user accounts. Organizations must ensure that all application functions properly validate user permissions before executing privileged operations, with clear audit trails documenting access attempts and violations. The most effective remediation involves upgrading to version 2.3.1 or later where proper ACL enforcement has been implemented, combined with network segmentation and monitoring of access control violations to detect potential exploitation attempts. Additionally, security teams should conduct thorough penetration testing to identify any remaining access control gaps within the application architecture.