CVE-2026-109637 in ERPNext
Summary
by MITRE • 10/13/2026
Frappe ERPNext before 16.14.0 contains a missing authorization vulnerability that allows authenticated users to modify master data beyond their permitted role. Attackers can send requests to certain endpoints lacking proper authorization checks to make unauthorized changes to master data records.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in Frappe ERPNext versions prior to 16.14.0 represents a critical failure in access control mechanisms, specifically classified under CWE-285 Improper Authorization. This flaw allows authenticated users to perform actions that exceed their assigned role permissions, effectively bypassing the intended security boundaries of the application. In enterprise resource planning systems like ERPNext, master data serves as the foundational layer for business operations, containing critical information such as customer details, supplier records, item catalogs, and pricing structures. The integrity of this data is paramount to maintaining accurate financial reporting, supply chain management, and overall operational consistency within an organization.
The technical root cause lies in specific API endpoints or web interfaces that process requests related to master data modification without adequately verifying the requesting user's privileges against a centralized authorization policy. While the system correctly authenticates users upon login, it fails to enforce role-based access control (RBAC) checks during subsequent state-changing operations. An attacker who has obtained valid credentials for any authenticated account can exploit this gap by crafting specific HTTP requests that target these unprotected endpoints. Because the server does not validate whether the user's role permits modification of the targeted master data record, it processes the request as if it were authorized, leading to unauthorized updates or deletions.
The operational impact of this vulnerability is severe and multifaceted. Beyond the immediate risk of data corruption, which can lead to significant financial losses due to incorrect invoicing, inventory discrepancies, or flawed procurement decisions, there are substantial implications for regulatory compliance. Many industries require strict audit trails and separation of duties to prevent fraud and ensure accountability. By allowing a single user to alter master data without proper oversight, the system violates these principles, potentially exposing the organization to legal liabilities and reputational damage. Furthermore, this lack of authorization control can serve as an initial foothold for more sophisticated attacks, such as privilege escalation or lateral movement within the network if the ERPNext instance is integrated with other critical systems.
From a threat modeling perspective, this vulnerability aligns with MITRE ATT&CK technique T1078 Valid Accounts, where attackers leverage legitimate credentials to gain access and perform malicious actions that should be restricted by policy. The exploitation does not require complex injection techniques or buffer overflows; instead, it relies on the simple misconfiguration of authorization logic within the application framework. This makes the vulnerability particularly dangerous as it can be exploited with minimal technical sophistication once valid user accounts are compromised through phishing, credential stuffing, or other common attack vectors.
To mitigate this risk, organizations running Frappe ERPNext must immediately upgrade to version 16.14.0 or later, where these authorization checks have been implemented and validated. For environments that cannot be updated instantly due to compatibility constraints with custom apps or integrations, temporary mitigations should include restricting network access to the ERPNext instance to only trusted IP addresses and enforcing strict multi-factor authentication for all user accounts to reduce the likelihood of credential compromise. Additionally, administrators should review existing role definitions to ensure they adhere to the principle of least privilege, minimizing the potential blast radius if an account is compromised. Regular security audits focusing on API endpoint authorization logic are also recommended to detect similar gaps in custom modules or third-party integrations that may not receive automatic patches from the core framework updates.