CVE-2026-67442 in FUXA
Summary
by MITRE • 08/19/2026
FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.3.3, DELETE /api/roles removes role definitions through server/runtime/users/usrstorage.js but does not remove the deleted role identifier from each user's info.roles array or the runtime usersMap cache. If a permission configuration still references that identifier, an affected user can retain authorization rights that an administrator intended to revoke, causing residual privilege, inconsistent access-control state, and misleading audit results. This issue is fixed in version 1.3.3.
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Analysis
by VulDB Data Team • 08/19/2026
FUXA serves as a web-based Process Visualization software designed for SCADA, HMI, and dashboard applications, facilitating the monitoring and control of industrial processes through a browser interface. The security vulnerability identified within versions prior to 1.3.3 centers on an improper access control mechanism related to role management. Specifically, when an administrator executes a DELETE request against the /api/roles endpoint to remove specific role definitions from the server runtime storage located at usrstorage.js, the system fails to perform necessary cleanup operations on associated user data structures. This architectural flaw results in orphaned references where deleted role identifiers persist within individual users' info.roles arrays and remain cached in the runtime usersMap object.
The technical root cause of this vulnerability lies in the lack of cascading deletion or synchronization logic during the role removal process. While the definition of the role itself is successfully purged from the central storage, the system does not iterate through existing user profiles to strip out references to that now-defunct role identifier. Consequently, if any permission configuration file or internal access control list continues to reference this specific identifier, the authentication and authorization modules may still interpret it as a valid credential. This discrepancy creates a state where the server's understanding of available roles diverges from its interpretation of user permissions derived from cached data structures that were not updated during the deletion event.
The operational impact of this flaw is significant for industrial control systems relying on FUXA for access management. An affected user can retain authorization rights that an administrator explicitly intended to revoke, leading to residual privilege escalation scenarios. This inconsistency in access-control state means that security policies are enforced unevenly across different sessions or administrative actions. Furthermore, the presence of these orphaned role identifiers leads to misleading audit results, as logs may indicate successful revocation while the underlying system continues to grant elevated privileges based on stale data. In a SCADA environment where strict adherence to least-privilege principles is critical for preventing unauthorized operational changes, this vulnerability undermines the integrity of the security posture and complicates forensic analysis during incident response activities.
This issue aligns with CWE-284 Improper Access Control, as it involves a failure to properly enforce restrictions on authorized users regarding role-based permissions. Additionally, it relates to CWE-670 Always Incorrect Control Flow Implementation, specifically in the context of state management and data consistency following administrative actions. From an ATT&CK perspective, this vulnerability facilitates Privilege Escalation via Tactic TA0004 by allowing users to maintain access levels they should no longer possess due to incomplete cleanup procedures during role deletion.
To mitigate this risk, organizations running FUXA must upgrade immediately to version 1.3.3 or later, where the developers have implemented proper cascading logic to ensure that deleting a role also removes its identifier from all associated user records and clears relevant cache entries. Until an upgrade is performed, administrators should exercise extreme caution when modifying roles and consider manually verifying user permission sets after any deletion operation. Regular audits of access control lists and review of system logs for inconsistencies between defined roles and actual granted permissions can help detect residual privilege issues in legacy deployments. Implementing strict change management protocols that include post-modification validation steps is also recommended to ensure the integrity of role-based access controls within the industrial automation environment.