Description

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote attacker to gain unauthorized access to sensitive API catalog and runtime configuration data due to improper authentication. Information supplied by the client is not sufficiently verified, which could allow a caller to appear as a trusted party.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-11-07T05:18:33.440Z",
  "pubdate": "2026-11-07T05:18:33.440Z",
  "executiveSummary": "This vulnerability involves an improper authentication flaw within IBM API Connect, affecting versions 12.1.0.0 through 12.1.1.2. The security defect resides in the validation logic of client-supplied information, which fails to adequately verify the identity of the requester. Consequently, this allows remote, unauthenticated attackers to impersonate trusted entities or circumvent established security boundaries.\nThe primary impact of this vulnerability is the unauthorized disclosure of sensitive API catalog metadata and runtime configuration data. By successfully exploiting this weakness, an attacker can gain deep visibility into an organization's API infrastructure, potentially exposing internal service endpoints, authentication schemas, and business logic structures.\nThe risk is critical for enterprise environments relying on IBM API Connect for secure traffic management and gateway orchestration, as it undermines the fundamental trust model of the API management platform. Exploitation does not require prior authentication, significantly lowering the barrier to entry for adversaries seeking to perform reconnaissance or conduct secondary attacks against internal microservices.",
  "technicalDetails": "The vulnerability is rooted in an insufficient verification mechanism during the authentication and authorization handshake within IBM API Connect. When the gateway processes incoming requests, it evaluates information supplied by the client to determine the request's origin and legitimacy. Due to a flaw in the input validation logic, the system does not properly cryptographically verify or sanitise the provided credentials or identity headers before granting access to sensitive internal resources.\nThe exploitation flow begins with the attacker crafting a malicious request directed at the API Connect runtime or management interface. By manipulating specific headers or identity claims within the request payload, the attacker successfully triggers the faulty authentication path. The system incorrectly validates these manipulated fields, leading the application logic to treat the unauthorized connection as a legitimate, trusted request.\nOnce the trust boundary is bypassed, the attacker can interact with the API catalog and retrieve protected runtime configuration data. This data often includes sensitive metadata such as endpoint definitions, backend service URIs, security policy configurations, and potentially exposed API keys or OAuth client secrets. The vulnerability essentially allows for a 'confused deputy' scenario where the API gateway is coerced into acting on behalf of an untrusted actor without performing the required security assertions.\nBecause the defect exists at the protocol or request-parsing layer of the gateway, it is exposed to any network path capable of reaching the API Connect interface. There are no complex prerequisites, such as specific user privileges or session requirements, as the vulnerability itself serves to bypass the authentication gate. Post-exploitation, the impact involves total exposure of the API inventory. An attacker could map out the entire organizational API surface, identify vulnerable backends for subsequent exploitation, or exfiltrate configuration details that facilitate lateral movement within the network. The ability to masquerade as a trusted party allows for persistent, low-profile information gathering, as the illicit traffic may appear indistinguishable from standard administrative or developer activity within the management logs."
}