CVE-2026-18744 in VINCE
Summary
by MITRE • 08/12/2026
Any authenticated case participant can fetch any OTHER vendor's CaseStatement + per-vul CaseMemberStatus by supplying that member's id — test_func only checks _is_my_case, not ownership of kwargs['member']. Bypasses share_status; leaks embargoed vendor affected/not-affected + statement text cross-tenant.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical access control flaw in a collaborative case management system where authenticated users can bypass legitimate authorization mechanisms to access confidential information belonging to other vendors. The technical implementation contains a fundamental security gap in the test_func function which only validates whether a case belongs to the authenticated user through _is_my_case check but fails to verify ownership or authorization of the specific member identifier provided in the kwargs['member'] parameter. This design flaw creates a privilege escalation path where any authenticated case participant can retrieve CaseStatement data and per-vul CaseMemberStatus information for members from different vendors simply by knowing their member ID.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it enables cross-tenant data leakage that violates fundamental security boundaries between competing vendors in a shared threat intelligence environment. The leaked information includes embargoed vendor affected/not-affected status determinations along with detailed statement text content that typically contains sensitive threat intelligence, vulnerability assessments, and strategic business decisions. This cross-tenant information leakage creates significant risk for vendors who may be competing against each other in the cybersecurity market while sharing a common case management platform, potentially exposing competitive advantages or compromising ongoing security investigations.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-284 (Improper Access Control) and represents a clear violation of the principle of least privilege as defined in NIST SP 800-53. The flaw also maps to ATT&CK technique T1078.004 (Valid Accounts: Cloud Accounts) where legitimate authenticated users leverage their access to extract unauthorized information from other tenants or organizations within the same system. The vulnerability demonstrates a classic case of insufficient authorization checking where the system assumes that if a user can access a case, they can access all members within that case without proper validation.
The mitigation strategy requires implementing comprehensive member ownership verification in the test_func function, ensuring that each requested member identifier is validated against the authenticated user's permissions and the actual case membership relationships. Additional protections should include audit logging of all cross-tenant information access attempts, implementation of role-based access controls that enforce vendor isolation boundaries, and regular security testing to validate access control mechanisms. Organizations should also consider implementing data loss prevention measures that monitor for unauthorized cross-tenant data exfiltration patterns and establish clear policies around embargoed information handling within shared threat intelligence platforms.