Description

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to modify tool configuration and cause a denial of service due to improper authorization. Information supplied by the client is relied on when deciding what a user is allowed to do, which could allow unauthorized changes that disrupt service.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-11-07T05:18:41.320Z",
  "pubdate": "2026-11-07T05:18:41.320Z",
  "executiveSummary": "This vulnerability involves an improper authorization 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 tool configurations, leading to a potential denial of service (DoS) state.\nThe root cause resides in the application's reliance on client-supplied information to enforce authorization decisions. By failing to validate the integrity of user-provided data during access control checks, the system grants unauthorized users the capability to perform actions outside their designated permission scope.\nThe primary impact is the loss of availability and integrity regarding tool configuration settings. A successful exploit allows an authenticated actor to disrupt critical service operations, potentially rendering the API management environment unusable. Because the vulnerability requires prior authentication, it poses a significant risk to organizations where internal or third-party account compromise is a possibility. No specific technical exploit code is required beyond standard API interaction capabilities, making this a high-impact issue for administrators maintaining service availability.",
  "technicalDetails": "The vulnerability in IBM API Connect (versions 12.1.0.0 through 12.1.1.2) is rooted in an insecure implementation of the authorization logic responsible for managing tool configurations. Specifically, the application architecture demonstrates an over-reliance on client-provided metadata when evaluating whether an authenticated session possesses the necessary privileges to modify service-level settings.\nThe attack flow initiates when an authenticated user crafts an API request targeting the tool configuration management interface. During the processing of this request, the server inspects parameters provided by the client to determine the user's intended scope of action. Due to the lack of server-side validation against a secure, immutable session store or internal entitlement mapping, the application implicitly trusts these client-supplied inputs.\nBy manipulating the parameters—such as object IDs, permission flags, or scope headers—contained within the request payload, an attacker can bypass traditional role-based access control (RBAC) mechanisms. Essentially, the application fails to perform a secondary, robust check against the server’s authoritative access control list (ACL) before committing changes to the tool configuration. This allows an attacker to modify settings that they are otherwise prohibited from accessing.\nThe post-exploitation impact centers on a denial of service. Once the attacker successfully alters the tool configuration, they can introduce invalid parameters or remove critical dependencies, effectively forcing the service into an unstable or inaccessible state. This disruption interrupts the management plane of the API environment, preventing legitimate administrators from performing necessary service updates or policy deployments. Because the attack relies on logical manipulation rather than memory corruption, the exploit is persistent until an authorized administrator manually reverts the configuration changes, assuming they still maintain access to the administrative interfaces.\nThis vulnerability underscores a critical failure in enforcing the principle of least privilege within the web application backend. It demonstrates that authentication alone—while a necessary barrier—is insufficient if authorization checks are performed using untrusted, mutable client inputs. The lack of server-side state verification regarding permissions allows for privilege escalation in a functional context, where the attacker can influence the behavior of the application infrastructure by modifying the underlying operational logic of the tool itself."
}