CVE-2026-108876 in JeecgBoot
Summary
by MITRE • 10/11/2026
JeecgBoot through 3.9.5 contains a missing authorization vulnerability in the putCancelQuit handler of SysUserController, allowing any authenticated user to cancel user resignations. Low-privileged attackers can supply user ids and a tenantId parameter or X-Tenant-Id header to restore ended, pending, or refused tenant memberships to normal.
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Analysis
by VulDB Data Team • 10/11/2026
The identified vulnerability resides within the JeecgBoot framework version 3.9.5, specifically affecting the putCancelQuit handler in the SysUserController component. This flaw represents a critical failure in access control mechanisms, classified under CWE-862 as Missing Authorization. The core technical issue stems from an insufficient verification of user privileges before executing state-changing operations on tenant membership records. While the application correctly restricts certain administrative functions to high-level administrators, it fails to validate whether the authenticated actor possesses the specific authority required to manipulate resignation or termination requests for other users. This oversight allows any logged-in individual with valid credentials to interact directly with this endpoint without being subject to role-based access controls that would normally prevent such actions.
The operational impact of this vulnerability is significant in multi-tenant environments where user lifecycle management is automated or semi-manual. An attacker, even one operating with low-level privileges such as a standard end-user or junior staff member, can exploit the putCancelQuit endpoint to reverse administrative decisions regarding employee offboarding. By supplying specific user identifiers along with either a tenantId parameter in the request body or an X-Tenant-Id header, the attacker can restore terminated, pending, or refused tenant memberships back to their active state. This effectively nullifies security measures designed to revoke access for former employees or suspended accounts, potentially leading to unauthorized data retention and continued system access by individuals who should have been locked out.
From a threat modeling perspective aligned with MITRE ATT&CK frameworks, this vulnerability facilitates the TA0003 Persistence tactic through T1136 Create Account: Local Account mechanisms when used to restore existing user profiles, or more accurately aligns with privilege escalation behaviors where an actor maintains access they were intended to lose. The ability to manipulate tenant memberships also touches upon data integrity concerns, as it allows for the unauthorized modification of critical identity management records. In organizations relying on JeecgBoot for internal HR systems or customer relationship management platforms that integrate with external tenants, this flaw could allow malicious insiders or compromised low-privilege accounts to bypass offboarding procedures, thereby maintaining a foothold within the network infrastructure long after their employment has ended or their access should have been revoked.
Mitigation strategies must prioritize immediate patching of the JeecgBoot framework to version 3.9.6 or later where this authorization check is corrected. In environments where upgrading is not immediately feasible, administrators should implement a reverse proxy rule or Web Application Firewall policy that restricts direct access to the putCancelQuit endpoint exclusively for users holding specific administrative roles defined by internal security policies. Additionally, input validation on the tenantId and X-Tenant-Id headers should be reinforced to ensure they match the authenticated user's own tenant context unless explicit super-admin privileges are verified server-side. Regular audits of authentication logs against this controller can help detect exploitation attempts in real-time, allowing for rapid incident response before persistent access is established by attackers leveraging this authorization bypass.