Description

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

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.5",
  "pubDate": "2026-11-07T05:18:42.510Z",
  "pubdate": "2026-11-07T05:18:42.510Z",
  "executiveSummary": "This vulnerability involves an improper validation flaw within IBM API Connect, affecting versions 12.1.0.0 through 12.1.1.2. The security defect allows a remote authenticated attacker to bypass intended URL restrictions, leading to unauthorized sensitive information disclosure.\nThe vulnerability is classified as an improper input validation issue. By supplying specifically crafted URLs, an attacker can manipulate the application into interacting with unauthorized endpoints or resources that should remain inaccessible.\nThe risk is primarily centered on the exposure of backend services, internal network resources, or sensitive metadata that the API management layer is intended to protect. Successful exploitation requires the attacker to have valid authentication credentials within the environment, limiting the attack surface to those who have already established a session.\nThe impact includes potential data leakage, internal network reconnaissance, and the circumvention of security controls implemented via the API gateway. Organizations should prioritize updating to a patched version to restore proper input sanitization and URL request verification.",
  "technicalDetails": "The root cause of the vulnerability resides in the insufficient verification of user-supplied URL parameters during request processing within IBM API Connect. The application fails to adequately sanitize or enforce strict allow-listing for these URLs, enabling an attacker to force the gateway to initiate requests to unintended destinations.\nThe exploitation process begins when an authenticated user supplies a malicious URL string to an affected API endpoint. Because the input validation logic is flawed, the gateway component fails to identify that the URL points to restricted or internal infrastructure. Consequently, the gateway acts as a proxy or intermediary, executing the request on behalf of the attacker.\nThe attack flow follows a structured path: First, the authenticated attacker identifies an endpoint in the API Connect interface that accepts a URL parameter. Second, the attacker submits a request where the URL parameter is substituted with a target resource—such as an internal metadata service, private API, or sensitive backend host. Third, the IBM API Connect server processes the malformed request and transmits it to the target endpoint, believing it to be a legitimate internal operation. Finally, the response from the targeted resource is returned to the attacker, effectively bypassing any network-level or perimeter security controls.\nThis vulnerability is particularly dangerous because it grants the attacker the ability to perform Server-Side Request Forgery (SSRF)-like activity from the context of the trusted API gateway. By leveraging the gateway's position in the network architecture, the attacker can probe internal services that are otherwise isolated from the public-facing internet. The post-exploitation impact involves the exfiltration of sensitive information, such as service account tokens, internal configuration details, or unauthorized data access from backend systems that assume requests originating from the API gateway are inherently secure. The vulnerability persists across versions 12.1.0.0 through 12.1.1.2, requiring administrative intervention to remediate the flawed validation logic within the affected component's request handling pipeline."
}