Description

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote attacker to obtain sensitive information due to improper validation of endpoint URLs.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.3",
  "pubDate": "2026-11-07T05:18:43.273Z",
  "pubdate": "2026-11-07T05:18:43.273Z",
  "executiveSummary": "This vulnerability involves improper validation of endpoint URLs within IBM API Connect, affecting versions 12.1.0.0 through 12.1.1.2. The security flaw permits remote, unauthenticated attackers to bypass intended access controls and retrieve sensitive information from the environment.\nThe vulnerability resides in the way the API gateway processes or validates specific URL parameters or endpoint configurations. By manipulating these inputs, an attacker can influence the routing or resource retrieval mechanisms to access restricted data that should otherwise be protected by authorization policies.\nThe risk implication is significant as it potentially exposes backend service metadata, sensitive internal configuration data, or other protected information accessible via the API gateway. Exploitation requires network access to the API Connect management or gateway interfaces but does not necessitate specific user privileges.\nOrganizations utilizing the affected versions face a risk of unauthorized information disclosure, which could facilitate further reconnaissance or exploitation of downstream services. Immediate attention to security bulletins and application of recommended patches is required to mitigate this exposure.",
  "technicalDetails": "The vulnerability originates from a failure in the input validation logic within the IBM API Connect routing or proxy component. When the system receives a request, it performs an initial validation check on the target endpoint URL to determine whether the request should be routed to a specific destination.\nIn the affected versions (12.1.0.0 through 12.1.1.2), the validation mechanism is insufficiently robust. It fails to adequately sanitize or verify the structure and domain of the provided endpoint URL. This allows an attacker to craft malicious requests that bypass the intended security constraints designed to limit accessible backend resources.\nThe exploitation flow proceeds as follows: First, the attacker identifies an API endpoint or management interface where URL-based routing is performed. Second, the attacker submits a specially crafted request containing a manipulated URL. This URL is designed to leverage the lax validation logic, potentially utilizing techniques such as URL encoding, path traversal sequences, or alternative hostname representations that the validation routine fails to normalize or restrict.\nOnce the malicious request is processed by the gateway, the underlying routing logic incorrectly interprets the manipulated URL as a valid, authorized target. Instead of rejecting the request or forcing it through a strictly defined proxy path, the component permits the request to reach an unintended resource. This resource could be an internal management endpoint, a sensitive metadata service, or a restricted backend application that is exposed through the API gateway but intended to be isolated from external access.\nThe successful execution of this attack leads to unauthorized information disclosure. Because the request is processed in the context of the gateway, the payload returned to the attacker may include sensitive headers, internal network topologies, configuration secrets, or direct data from protected downstream services. This information can be leveraged by an attacker to map the internal architecture of the API environment or to steal credentials and sensitive business data.\nThe vulnerability does not inherently require authentication, as the flaw is triggered at the entry point of the request processing pipeline, prior to standard authorization checks that would otherwise prevent unauthorized access to these specific paths. Consequently, the exposure is limited only by the reachability of the affected API Connect components from the network, making it a critical concern for internet-facing or inter-network accessible deployments."
}