CVE-2026-55550 in NextCRM
Summary
by MITRE • 07/21/2026
NextCRM is open-source customer relationship management (CRM) software. The CRM product catalog is an organization-wide business object. Normal application server actions restrict product creation, update, and deletion to `manager` and `admin` roles. However, in version 0.12.1, the MCP product tools expose the same write operations through `/api/mcp/mcp` using user-generated Bearer tokens and do not enforce role checks. Any authenticated low-privileged user who can generate an MCP API token can create, modify, archive, or soft-delete products in the shared CRM product catalog. Version 0.12.3 contains a fix.
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Analysis
by VulDB Data Team • 07/21/2026
This vulnerability represents a critical authorization bypass flaw in NextCRM version 0.12.1 that undermines the application's role-based access control mechanisms. The issue stems from inconsistent security enforcement across different API endpoints within the same application, specifically affecting the MCP product tools functionality. While standard application server operations properly restrict product catalog modifications to manager and admin roles, the dedicated MCP API endpoint at /api/mcp/mcp fails to implement equivalent authorization checks, creating a dangerous privilege escalation vector.
The technical implementation flaw allows any authenticated user with the ability to generate MCP API tokens to perform write operations on the shared CRM product catalog regardless of their assigned role permissions. This represents a classic case of missing authorization validation where the system assumes that token generation alone provides sufficient security context, failing to validate whether the requesting user possesses adequate privileges for the requested action. The vulnerability specifically affects product creation, modification, archiving, and soft-deletion operations, all of which can be executed through the exposed MCP endpoint without proper role verification.
The operational impact of this vulnerability is significant as it enables low-privileged users to manipulate critical business data that should remain restricted to authorized personnel only. Since the product catalog is an organization-wide business object, unauthorized modifications could lead to data integrity issues, incorrect pricing information, invalid product records, and potential business disruption. Attackers could exploit this vulnerability to introduce malicious products, modify existing product details, or remove legitimate entries from the shared catalog, potentially affecting multiple departments and workflows that depend on accurate product information.
This vulnerability aligns with CWE-285 (Improper Authorization) and represents a failure in implementing proper access control validation at the API endpoint level. From an attacker's perspective, this issue maps to several ATT&CK techniques including privilege escalation through unauthorized modifications and data manipulation. The lack of role-based enforcement in the MCP API endpoint creates a persistent security gap that could be exploited by both internal malicious actors and external attackers who gain access to legitimate user credentials. Organizations using NextCRM version 0.12.1 should immediately implement the fix available in version 0.12.3, which properly enforces role-based access controls for all product catalog operations across both standard and MCP API endpoints.
The root cause of this vulnerability demonstrates poor security design practices where different application modules fail to maintain consistent authorization policies. Proper implementation would require enforcing the same role validation checks in the MCP endpoint that exist in the main application server, ensuring that token-based authentication properly validates user privileges before allowing any write operations on shared business objects. The fix in version 0.12.3 should include comprehensive authorization checks that validate user roles against the requested operations, regardless of the API endpoint used to access the functionality.