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": "2026-11-07T05:18:29.457Z",
  "pubdate": "2026-11-07T05:18:29.457Z",
  "executiveSummary": "This vulnerability involves an improper validation flaw within IBM API Connect versions 12.1.0.0 through 12.1.1.2. The security defect allows a remote, authenticated attacker to manipulate user-supplied URL inputs, potentially leading to the unauthorized disclosure of sensitive information.\nThe vulnerability is categorized as an improper input validation issue. By bypassing restrictive URL filtering mechanisms, an attacker can coerce the application into interacting with arbitrary, unintended, or internal endpoints. This capability poses significant risk to the integrity of sensitive data and the confidentiality of backend infrastructure.\nSuccessful exploitation requires the attacker to possess authenticated access to the API Connect management or gateway interfaces. The impact is primarily identified as information disclosure, which may include internal network topology discovery, access to metadata, or the exfiltration of sensitive configuration data depending on the service response. Organizations utilizing the affected software versions are encouraged to monitor for unauthorized requests and apply necessary updates to neutralize the attack vector.",
  "technicalDetails": "The vulnerability resides in the input handling and URL processing logic within the affected IBM API Connect components. Specifically, the system fails to sufficiently sanitize or validate user-provided URL strings before processing them within backend requests or service lookups. This allows an attacker to inject malicious or malformed URLs that bypass intended security perimeters.\nThe root cause is a failure in the application’s validation layer to strictly enforce allow-lists or perform comprehensive canonicalization of input strings. When a user-supplied URL is accepted without rigorous structural analysis, the application may inadvertently perform Server-Side Request Forgery (SSRF) or similar resolution tasks directed at unauthorized resources.\nExploitation follows a specific flow: First, an authenticated attacker identifies an entry point or API configuration field where a URL parameter is accepted. Second, the attacker crafts a payload containing a target URL that points to internal resources, sensitive services, or external endpoints that would otherwise be unreachable. Third, the attacker submits this payload via the API or management console. Upon processing, the vulnerable component resolves the attacker-supplied URL without verifying the destination's legitimacy or safety.\nThe impact of this exploitation includes unauthorized information disclosure. By forcing the system to perform requests on behalf of the attacker, the application may return data from internal systems (e.g., cloud metadata services, internal database endpoints, or management interfaces) back to the attacker’s session. Because the request originates from the trusted API Connect infrastructure, it bypasses network-level firewalls that typically restrict direct external access to these internal resources.\nThis vulnerability is restricted to versions 12.1.0.0 through 12.1.1.2. Because it requires authentication, the scope of the threat is centered on authorized users or compromised accounts acting as malicious actors within the environment. Post-exploitation, an attacker can escalate reconnaissance efforts, potentially gathering enough intelligence to map backend infrastructure or capture sensitive configuration keys exposed through the exploited URL resolution process."
}