CVE-2026-92601 in Guns
Summary
by MITRE • 09/16/2026
Guns through 8.3.5 contains an improper access control vulnerability in SysNoticeController where requiredPermission defaults to false and is not overridden by any action methods. Authenticated users without assigned roles can exploit this to create, edit, delete, publish and retract system-wide notices affecting arbitrary users and departments.
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability represents a critical failure in access control mechanisms within the SysNoticeController component of Guns versions prior to 8.3.5. This flaw stems from an improper configuration where the requiredPermission attribute is initialized with a default value of false, indicating no specific permissions are necessary for execution. Crucially, this restrictive setting is not overridden by any of the action methods exposed through the controller's endpoints. Consequently, the system fails to enforce role-based access controls that should restrict sensitive administrative functions to authorized personnel only. This architectural oversight allows authenticated users who lack assigned roles or sufficient privileges to bypass security checks entirely when interacting with notice management features.
From a technical perspective, this vulnerability aligns closely with CWE-284 Improper Access Control and CWE-732 Incorrect Permission Assignment for Critical Resource. The core issue lies in the default configuration of the permission check logic. In secure applications, access control decisions should explicitly require specific roles or permissions unless there is a deliberate design choice to allow public access, which is rarely appropriate for administrative functions like managing system-wide notices. By leaving requiredPermission as false and failing to validate it against user attributes during request processing, the application effectively disables authentication checks for these endpoints. This creates an open path for any authenticated individual, regardless of their privilege level, to execute high-impact operations.
The operational impact of this vulnerability is severe due to the nature of the affected functionality. System-wide notices are typically used by administrators to communicate important information across arbitrary user groups and departments within an organization. An attacker exploiting this flaw can create false or malicious announcements that appear official, potentially leading to social engineering attacks such as phishing or misinformation campaigns targeting employees. Furthermore, the ability to edit existing notices allows for tampering with critical communications, while deleting them can disrupt operational workflows by removing urgent alerts or instructions. The capability to publish and retract notices adds further complexity, enabling attackers to manipulate visibility timelines of malicious content, making detection and remediation more difficult after exploitation occurs.
This vulnerability maps directly to the MITRE ATT&CK technique T1078 Valid Accounts, as it requires initial authentication but then exploits weak authorization controls. It also relates to T1496 Endpoint Denial of Service if notices are deleted or corrupted in a way that disrupts business continuity. The ability to affect arbitrary users and departments amplifies the blast radius, potentially impacting multiple organizational units simultaneously. Attackers can leverage this for data integrity violations by altering official records or reputational damage by spreading harmful messages under the guise of system administration.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary fix involves updating to Guns version 8.3.5 or later, where this permission logic has been corrected to enforce proper role-based access control. For environments unable to update immediately, a temporary workaround should involve implementing an additional middleware or interceptor layer that explicitly validates user roles against the required permissions for SysNoticeController endpoints before allowing request processing. Security teams should also audit other controllers in the application for similar patterns of defaulting permission checks to false without explicit override mechanisms. Regular security code reviews focusing on access control logic and automated testing using tools that detect improper authorization flaws are essential to prevent recurrence. Additionally, implementing comprehensive logging and monitoring for notice creation and modification events can aid in rapid detection of any unauthorized activity resulting from this vulnerability.