CVE-2026-59712 in Leantime
Summary
by MITRE • 07/07/2026
Leantime's Users::getUser method in the JSON-RPC API lacks proper authorization checks, allowing authenticated users to retrieve full user credential rows including password hashes, TOTP secrets, and session tokens. Attackers can exploit this by calling users.getUser with arbitrary user IDs to enumerate all accounts and obtain credentials for offline password cracking, 2FA bypass, and session hijacking.
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Analysis
by VulDB Data Team • 07/07/2026
The vulnerability resides in leantime's JSON-RPC API implementation where the Users::getUser method fails to enforce proper access controls. This authorization flaw allows any authenticated user to invoke the users.getUser RPC endpoint with arbitrary user identifiers, thereby bypassing normal permission boundaries that should restrict data access based on user roles and privileges. The method returns complete user credential records including sensitive information such as password hashes, time-based one-time passwords secrets, and active session tokens. This represents a critical security weakness that directly violates the principle of least privilege and demonstrates poor input validation practices.
The technical exploitation of this vulnerability follows a systematic approach where attackers first establish authentication access to the system, then leverage the RPC interface to systematically query user accounts by ID. The absence of proper authorization checks means that users can enumerate all valid accounts within the system and obtain comprehensive credential information for each target. This creates multiple attack vectors including offline password cracking attacks where hash values can be processed using rainbow tables or brute force techniques, 2FA bypass scenarios where TOTP secrets enable attackers to generate valid authentication codes, and session hijacking operations that allow unauthorized access to active user sessions.
The operational impact of this vulnerability extends beyond simple credential theft to encompass broader system compromise capabilities. Attackers can systematically map out all user accounts within the organization, identify high-value targets such as administrators or privileged users, and then utilize the stolen credentials for persistent access. The exposure of session tokens specifically enables real-time session hijacking attacks that can occur without detection, while password hashes provide attackers with offline cracking opportunities that may ultimately lead to complete system compromise. This vulnerability directly relates to CWE-285 which addresses insufficient authorization issues in software systems and aligns with attack patterns documented in the MITRE ATT&CK framework under credential access and privilege escalation techniques.
Organizations should implement immediate mitigations including mandatory authorization checks for all RPC endpoints that return user data, enforcing strict access control policies based on user roles and permissions, and implementing proper input validation to prevent arbitrary user ID enumeration. The system must ensure that users can only access information about their own accounts or accounts they are explicitly authorized to view. Additionally, session tokens should be rotated regularly and stored securely using proper cryptographic practices. Network segmentation and monitoring controls should be deployed to detect anomalous RPC access patterns and unauthorized account enumeration attempts. Regular security assessments including penetration testing and code reviews should verify that similar authorization flaws do not exist in other API endpoints within the system.