CVE-2026-108650 in JeecgBoot
Summary
by MITRE • 10/11/2026
JeecgBoot through 3.9.5 contains a missing authorization vulnerability in the getUserPermissionSet handler of SystemApiController that allows any authenticated user to read other users' permission codes. Low-privileged attackers can supply an arbitrary userId to GET /sys/api/getUserPermissionSet to retrieve the full permission set of any account, including administrators.
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Analysis
by VulDB Data Team • 10/11/2026
The identified vulnerability resides within the JeecgBoot framework version 3.9.5 and specifically affects the SystemApiController component. This security flaw is classified as a missing authorization issue, which fundamentally represents an access control failure where the application fails to properly verify whether the authenticated user has permission to perform actions on specific resources. In this particular instance, the vulnerability impacts the getUserPermissionSet handler, a function designed to retrieve the set of permissions associated with a given user account. The core technical flaw lies in the lack of validation for the userId parameter supplied by the client during API requests. Instead of restricting access to only the currently authenticated session's own data or requiring elevated privileges for cross-user queries, the endpoint blindly trusts the input provided by the requester. This design oversight allows any logged-in user, regardless of their role level, to manipulate the request payload and specify an arbitrary userId value.
From a technical perspective, this vulnerability enables horizontal privilege escalation through IDOR principles, although it is technically categorized under missing function-level access control due to its impact on administrative data structures rather than just file or object ownership. By supplying a different user identifier in the GET /sys/api/getUserPermissionSet request, an attacker can bypass intended security boundaries and retrieve the complete permission set of another account. This includes high-privilege accounts such as system administrators. The retrieved information typically contains detailed mappings of roles, menu access rights, button-level permissions, and API endpoint authorizations associated with the target user. For a low-privileged attacker, this capability is particularly dangerous because it provides comprehensive intelligence about the application's security architecture without requiring any initial elevation of privilege beyond basic authentication.
The operational impact of this vulnerability extends significantly beyond simple data leakage. The exposure of administrative permission sets allows attackers to map out the full scope of access controls within the JeecgBoot environment. This information can be leveraged for subsequent attacks, such as crafting precise requests to exploit other potential vulnerabilities in endpoints that are protected by specific permissions which the attacker now knows exist but may not have direct access to via standard UI navigation. Furthermore, understanding the permission structure aids attackers in identifying high-value targets and planning lateral movement within the system. If combined with other weaknesses like weak password policies or session management flaws, this information disclosure can serve as a critical stepping stone for full account takeover of privileged users. The vulnerability aligns closely with CWE-285 Improper Authorization, highlighting the failure to enforce proper access control checks before granting data access. Additionally, it relates to ATT&CK technique T1078 Valid Accounts, as attackers utilize legitimate credentials to harvest sensitive configuration and authorization metadata that should be restricted to administrative functions only.
Mitigation strategies for this vulnerability must focus on implementing robust server-side validation of the userId parameter within the getUserPermissionSet handler. The most effective remediation is to enforce strict ownership verification by ensuring that a user can only retrieve their own permission set unless they possess explicit administrator privileges with verified role-based access control checks at the method level. Developers should implement middleware or interceptors that validate the relationship between the authenticated session's identity and the requested resource identifier before processing the query. Additionally, applying principle of least privilege to API endpoints is essential; administrative functions such as retrieving other users' permission sets should be restricted exclusively to roles with explicit admin rights rather than being accessible to all authenticated users. Regular security code reviews focusing on access control logic in RESTful APIs are recommended to prevent similar issues across the application surface.