CVE-2026-17387 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 ranging from 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 the concept of broken object-level authorization. This type of flaw occurs when an application verifies that a user is authenticated but fails to adequately verify whether that specific user has permission to perform actions on or view data associated with other users or distinct objects within the system. In the context of API Connect, which serves as a platform for managing and securing APIs, such a deficiency can have severe consequences for organizations relying on it to govern their digital services. The core technical flaw lies in the server-side logic that processes requests related to specific resource identifiers. When an authenticated user issues a request targeting a particular object or data set identified by a unique ID, the application does not sufficiently validate that the requesting entity owns that object or has explicit administrative privileges over it. This oversight allows attackers who possess valid credentials for one account to manipulate parameters in their HTTP requests, such as changing numeric IDs or UUIDs in URLs and API payloads, to access resources belonging to other tenants or users within the same multi-tenant environment.
The operational impact of this vulnerability is significant, primarily centering on the unauthorized disclosure of sensitive information. Because IBM API Connect often handles critical business logic, customer data, and internal service configurations, an attacker exploiting this flaw can extract proprietary data, personal identifiable information, or confidential configuration details that were intended to be isolated per user or tenant. This breach of confidentiality undermines the trust model inherent in multi-tenant architectures where isolation between customers is paramount. Furthermore, while the primary description highlights information disclosure, broken object-level authorization often serves as a stepping stone for more severe attacks. An attacker might use this access to modify data belonging to other users, leading to integrity violations, or escalate privileges by manipulating administrative settings if they can reach endpoints that control broader system configurations. The ability to traverse between objects without proper checks effectively nullifies the security boundaries established during user authentication and session management phases.
From a classification perspective, this vulnerability aligns directly with CWE-639, which is defined as Authorization Bypass Through User-Controlled Key. This weakness describes scenarios where an application relies on client-supplied data to determine access rights without server-side validation against the actual owner of the resource. Additionally, in terms of adversary tactics and techniques, this behavior maps closely to MITRE ATT&CK technique T1078, specifically Valid Accounts, combined with lateral movement or privilege escalation patterns found in cloud environments like AWS S3 Bucket Misconfiguration (T1535) if we consider object storage analogies. The attacker leverages valid credentials but abuses the lack of proper authorization checks to move laterally across data objects that should be inaccessible. This is particularly dangerous in API ecosystems where automation and programmatic access are common, as automated scripts can rapidly enumerate resources by iterating through sequential IDs once a starting point or pattern is discovered.
Mitigation strategies for this vulnerability must focus on implementing robust server-side authorization checks at every endpoint that exposes resource-specific data. Developers should ensure that each request includes validation logic that compares the identity of the authenticated user against the ownership attribute of the requested object, rejecting any mismatch with an appropriate error code such as 403 Forbidden rather than a generic 404 Not Found to prevent enumeration attacks. It is also advisable to use indirect references or opaque identifiers instead of sequential numeric IDs where possible, making it harder for attackers to guess valid resource keys. For organizations currently running the affected versions, applying the latest security patches provided by IBM is the primary remediation step. Until patching can be performed, network-level controls such as Web Application Firewalls may help detect anomalous patterns in request parameters that suggest ID enumeration attempts, although this is a compensatory control rather than a fix for the underlying logic flaw. Regular code reviews focusing on access control lists and role-based access control implementations are essential to prevent similar issues from being introduced into other parts of the application ecosystem.