CVE-2026-109171 in yshop-crm
Summary
by MITRE • 10/12/2026
yshop-crm through 2.1.3 contains a missing authorization vulnerability that allows any authenticated back-office user to approve or reject contracts by calling POST /admin-api/crm/contract/check. Because CrmContractController lacks @PreAuthorize and approver checks are commented out, attackers can approve contracts to alter customer deal and purchase data or reject them to return products to stock.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified in yshop-crm versions through 2.1.3 represents a critical failure in access control mechanisms within the application's back-office administrative interface. Specifically, this is an insecure direct object reference combined with missing function-level authorization, allowing any authenticated user to perform sensitive operations intended for higher-privileged roles or specific approvers. The core technical flaw resides in the CrmContractController class, which handles requests directed at the POST /admin-api/crm/contract/check endpoint. In a properly secured enterprise application, such endpoints should enforce strict role-based access control and verify that the requesting user has explicit permission to approve or reject contracts based on their assigned responsibilities within the organization's workflow.
From an architectural perspective, the absence of the @PreAuthorize annotation in the CrmContractController indicates a significant oversight in implementing Spring Security best practices for method-level security. This annotation is typically used to define access rules that are evaluated before the controller method executes. Without it, the application relies solely on session authentication rather than granular authorization checks. Furthermore, the codebase reveals that explicit approver verification logic has been commented out or removed entirely. This means there is no runtime validation ensuring that the user initiating the contract approval or rejection actually holds the requisite authority to do so. Consequently, any individual with valid credentials for the back-office portal can manipulate this endpoint without restriction.
The operational impact of this vulnerability is substantial and affects both data integrity and business logic consistency. An attacker who gains access to an authenticated account can approve contracts that should remain pending or rejected, thereby altering customer deal statuses and purchase records in ways not authorized by management. This could lead to financial discrepancies, incorrect inventory levels, and compromised audit trails. Conversely, the ability to reject contracts allows malicious actors to return products to stock artificially, disrupting supply chain operations and potentially causing stockouts for legitimate customers. These actions undermine the reliability of the CRM system and can result in significant reputational damage and operational disruption for the organization relying on yshop-crm.
This vulnerability aligns with CWE-269, which describes Improper Privilege Control, as it allows users to bypass intended restrictions by exploiting a lack of proper authorization checks. Additionally, from an offensive security perspective such as MITRE ATT&CK, this behavior is consistent with techniques involving privilege escalation or unauthorized access to administrative functions. The exploitation does not require complex injection attacks or buffer overflows; instead, it leverages the fundamental principle that authentication alone is insufficient for securing sensitive business operations without accompanying authorization controls.
To mitigate this vulnerability, developers must immediately restore and enforce proper role-based access control on the CrmContractController endpoints. This involves re-introducing the @PreAuthorize annotation with appropriate expressions that verify the user's roles or permissions before allowing contract approval or rejection actions to proceed. It is also critical to ensure that any commented-out approver checks are reinstated and validated against a secure, server-side database of authorized personnel rather than relying on client-supplied data. Regular security code reviews should be implemented to catch such oversights early in the development lifecycle. Additionally, implementing audit logging for all contract status changes can help detect unauthorized activities post-deployment, providing an additional layer of defense through monitoring and alerting mechanisms.