CVE-2026-109185 in jshERP
Summary
by MITRE • 10/12/2026
jshERP through 3.6 contains a missing authorization vulnerability in the UserController updateUser handler that allows authenticated users to assign arbitrary roles to any user. Low-privilege attackers can send their own user id with the tenant administrator roleId to escalate privileges or rebind other tenant users' roles.
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Analysis
by VulDB Data Team • 10/12/2026
The jshERP software, specifically through version 3.6, contains a critical missing authorization vulnerability within its UserController updateUser handler. This flaw stems from an insufficient verification of access control permissions when processing requests intended to modify user account details and associated role assignments. The core technical issue lies in the application's failure to validate whether the authenticated actor initiating the request possesses the necessary administrative privileges or ownership rights over the target user identity being modified. Instead of restricting updates to only those users who are authorized administrators for a specific tenant, the system allows any logged-in user to manipulate the role parameters associated with arbitrary user identifiers within their own tenant context. This architectural oversight effectively bypasses standard horizontal and vertical privilege separation mechanisms that should enforce strict boundaries between low-privilege end-users and high-privilege administrative accounts.
From an operational perspective, this vulnerability enables a severe escalation of privileges for attackers possessing only basic authenticated access to the jshERP platform. By crafting specific HTTP requests where they supply their own user identifier alongside the role ID corresponding to a tenant administrator or other elevated privilege level, low-privilege users can effectively grant themselves administrative rights. Furthermore, because the flaw allows rebinding roles across different accounts within the same tenant, an attacker could also demote legitimate administrators by stripping them of their privileges while simultaneously assigning those high-level permissions to their own account or another compromised identity. This capability fundamentally undermines the integrity of the multi-tenant security model, as it allows a single malicious actor to gain full control over the application's administrative functions without requiring external exploitation techniques such as SQL injection or cross-site scripting.
The impact of this vulnerability extends beyond simple privilege escalation to encompass broader risks related to data confidentiality and system availability. Once an attacker achieves administrator-level access through role manipulation, they can potentially export sensitive business data, modify critical configuration settings, install malicious plugins or integrations, and delete audit logs to cover their tracks. In a multi-tenant environment, while the vulnerability is scoped within a single tenant, the compromise of administrative controls for that tenant represents a complete loss of security posture for all users operating under that specific organizational boundary. The ability to arbitrarily assign roles also facilitates lateral movement if other systems are integrated with jshERP using shared credentials or trust relationships derived from its authentication mechanisms.
This vulnerability aligns closely with CWE-269, which classifies Improper Privilege Management, specifically highlighting the failure of an actor to elevate privileges when they lack appropriate authorization. Additionally, it maps directly to MITRE ATT&CK technique T1078, Valid Accounts, where attackers leverage legitimate credentials and manipulate access controls to gain higher-level permissions within a system. The specific action of assigning roles corresponds to privilege escalation behaviors often observed in enterprise resource planning systems that rely on role-based access control models but fail to implement robust server-side validation for administrative actions.
To mitigate this vulnerability, developers must immediately enforce strict authorization checks at the controller level before processing any updates to user profiles or role assignments. The application should verify that the authenticated user initiating the request is a designated tenant administrator and explicitly owns or has management rights over the target user account being modified. Implementing an access control framework such as Spring Security with method-level security annotations can help ensure that only users with specific roles, such as ROLE_ADMIN_TENANT, are permitted to execute privilege-changing operations. Furthermore, adopting a principle of least privilege for API endpoints and conducting regular code reviews focused on authorization logic will prevent similar flaws from being introduced in future updates. Patching to the latest version where this issue has been resolved is essential, alongside auditing existing user roles to ensure no unauthorized elevations have occurred during the window of exposure.