| 제목 | Frappe Technologies Pvt. Ltd. Frappe HR v16.15.0 Authorization Bypass Through User-Controlled Key (CWE-639) |
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| 설명 | Frappe HR v16.15.0 contains a shared IDOR flaw across get_expense_claims, get_shift_requests and get_attendance_requests APIs, allowing authenticated users to read other employees' financial and attendance records via uncontrolled employee parameter.
Vulnerability Overview
A cross-user authorization bypass (CWE-639) exists in multiple APIs sharing the unsafe get_filters helper function in hrms/api/__init__.py v16.15.0.
Affected functions: get_expense_claims (516-557), get_shift_requests (179-215), get_attendance_requests (218-253). The shared get_filters function directly uses attacker-supplied employee ID without permission validation when for_approval=false, enabling horizontal privilege escalation.
Vulnerable Logic
get_expense_claims passes user-controlled employee parameter to get_filters; line 281 sets filters.employee = employee with no frappe.has_permission("Employee", "read", employee) verification. The query returns full records of the target employee’s expense claims, shift requests and attendance logs.
Attack Vector
Authenticated remote HTTP POST to /api/method/hrms.api.get_expense_claims with JSON body:
{"employee": "EMP-TARGET-001"}
Valid session cookie is the only requirement. The same exploitation pattern applies to get_shift_requests and get_attendance_requests endpoints.
Impact
Attackers can retrieve third-party employees’ expense amounts, approval status, shift schedules and attendance history, leaking sensitive financial and work-time data across the organization.
Root Cause & Remediation
Root cause: The get_filters helper does not validate whether the requesting user has read access to the target employee record before applying user-controlled filter values.
Reference: get_expense_claim_summary safely restricts data to current authenticated employee via get_current_employee().
CVSS v3.1 Score: 6.5 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Discoverer: [Ordinaryzyx] |
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| 원천 | ⚠️ https://github.com/frappe/hrms |
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| 사용자 | zyx122126 (UID 100375) |
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| 제출 | 2026. 08. 09. PM 01:44 (2 개월 ago) |
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| 모더레이션 | 2026. 09. 27. PM 12:58 (2 months later) |
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| 상태 | 수락 |
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| VulDB 항목 | 410876 [Frappe HR 까지 16.15.0 Permission Validation hrms/api/__init__.py employee 권한 상승] |
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| 포인트들 | 19 |
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