CVE-2026-17388 in API Connect
Summary
by MITRE • 11/07/2026
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to obtain sensitive information due to broken object-level authorization.
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Analysis
by VulDB Data Team • 11/07/2026
The vulnerability identified in IBM API Connect versions 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 represents a critical failure in access control mechanisms, specifically categorized under CWE-639 as Authorization Bypass Through User-Controlled Key or ID. This flaw allows remote authenticated attackers to bypass intended restrictions on object-level authorization, thereby gaining unauthorized access to sensitive information that should be restricted to other users or administrative roles. The core technical issue stems from the application's failure to properly validate whether the requesting user has sufficient privileges to access a specific resource identified by an identifier such as a database ID, session token, or API endpoint parameter. Instead of enforcing strict checks against the authenticated identity and its associated permissions, the system relies on predictable or directly manipulatable identifiers provided in the request payload.
From a technical perspective, this vulnerability typically manifests when the backend logic retrieves data based solely on an input value without cross-referencing it against the current user's authorized resource list. For instance, if an API endpoint accepts a parameter like "resource_id=12345," the application may fetch and return details for that resource regardless of whether the authenticated session holds permission to view it. This lack of server-side validation creates a direct path for information disclosure. Attackers can exploit this by systematically iterating through sequential or easily guessable identifiers, effectively performing an enumeration attack to harvest confidential data such as customer records, internal configuration settings, or proprietary business logic exposed via the API gateway.
The operational impact of this vulnerability is significant, particularly in enterprise environments where IBM API Connect serves as a central hub for managing and securing microservices and APIs. The exposure of sensitive information can lead to severe compliance violations under regulations such as GDPR, HIPAA, or PCI-DSS, depending on the nature of the leaked data. Furthermore, the compromised integrity of access controls undermines trust in the platform's security posture. Attackers with even basic authentication credentials can escalate their privileges indirectly by gathering intelligence that facilitates further attacks, such as credential stuffing, social engineering, or targeted exploitation of other known vulnerabilities within the organization's infrastructure. This aligns closely with MITRE ATT&CK technique T1078, Valid Accounts, and specifically sub-technique T1528, Steal Application Access Token, where attackers leverage valid credentials to access resources they are not authorized for due to flawed authorization logic.
Mitigation strategies must focus on implementing robust server-side validation mechanisms that enforce strict object-level permissions. Developers should ensure that every API request is validated against the authenticated user's profile and their specific entitlements before processing any data retrieval or modification operations. This involves maintaining an explicit mapping of users to authorized resources rather than relying on implicit trust in input parameters. Additionally, implementing rate limiting and monitoring for unusual access patterns can help detect enumeration attempts early. For organizations using affected versions, upgrading to a patched version that addresses this authorization bypass is the primary remediation step. Until patches are applied, network-level controls such as Web Application Firewalls (WAFs) configured with rules to detect sequential ID manipulation or anomalous API traffic patterns may provide partial mitigation by blocking malicious requests before they reach the application logic.