CVE-2026-66059 in Frappe
Summary
by MITRE • 08/07/2026
Frappe is a full-stack web application framework. Prior to 16.20.0 and 15.112.0, a field-level permissions bypass exposes restricted DocType fields. This issue is fixed in versions 16.23.0 and 15.112.0.
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Analysis
by VulDB Data Team • 08/07/2026
The vulnerability identified in Frappe web application framework represents a critical field-level permissions bypass that undermines the security controls designed to protect sensitive data within Document Type (DocType) configurations. This flaw affects versions prior to 16.20.0 and 15.112.0, creating a scenario where unauthorized users can access restricted fields that should be hidden or protected based on user permissions. The issue resides in the framework's permission validation mechanisms, which fail to properly enforce field-level access controls during data retrieval operations.
The technical implementation of this vulnerability stems from insufficient validation checks within the DocType field access logic. When users request data through API endpoints or web interfaces, the system should verify whether the requesting user has appropriate permissions to view specific fields within a document. However, the flaw allows malicious actors to bypass these checks and retrieve restricted field information, effectively undermining the principle of least privilege that is fundamental to secure application design. This type of vulnerability aligns with CWE-285, which addresses insufficient authorization in access control systems, and represents a direct violation of proper access control enforcement mechanisms.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables potential attackers to gather sensitive information that may include personal identifiers, financial data, or confidential business information. Depending on the DocType configuration and field permissions set by administrators, an attacker could gain insights into user roles, system internals, or business-critical data that should remain protected. This exposure creates opportunities for further attacks including credential harvesting, social engineering, or exploitation of additional vulnerabilities within the application. The vulnerability can be exploited through various attack vectors including direct API calls, web interface manipulation, or even automated scanning tools that systematically test for permission bypasses.
Organizations using affected Frappe versions should immediately implement mitigation strategies focusing on both immediate remediation and operational security improvements. The primary solution involves upgrading to patched versions 16.23.0 or 15.112.0 where the field-level permissions bypass has been addressed through enhanced validation logic. Additionally, administrators should conduct comprehensive reviews of existing DocType field permissions to identify any potential misconfigurations that could exacerbate the impact of this vulnerability. Security teams should implement monitoring solutions to detect unusual access patterns or unauthorized data retrieval attempts that might indicate exploitation of this permission bypass. The mitigation approach aligns with ATT&CK technique T1078 which focuses on valid accounts and credential access, as unauthorized field access often represents an initial reconnaissance step in broader attack campaigns. Organizations should also consider implementing additional security controls such as network segmentation, API rate limiting, and enhanced logging to provide defense-in-depth against potential exploitation attempts.