External risk intelligence

IBM API Connect Account Takeover via Open Redirect Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-17297

IBM API Connect is an enterprise gateway solution designed to manage, expose, and secure APIs. These systems are typically deployed as public-facing edge services to handle external traffic. The vulnerability affects the sign-in redirect process, which is a common function exposed by API management platforms to facilitate authentication for external users and developers.

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in IBM API Connect, a platform used to manage and secure APIs. This issue could allow unauthorized individuals to take over accounts by redirecting users to malicious sites during the sign-in process, potentially exposing sensitive authentication details. The main concern is confirming relevance and exposure given the nature of the affected technology.

Open redirect flaw can lead to account takeover.
Affects API management, a key external-facing technology.
Verify relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by luring a user into clicking a crafted link. This link would redirect the user to a malicious site after they attempt to sign in, potentially leading to their account being compromised.

Requires user interaction via a link.
Unvalidated redirect during sign-in.
Account takeover via stolen credentials.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to redirect users to a malicious site during the sign-in process when the redirect address is not sufficiently validated. This could lead to authentication results being sent to an attacker-controlled location, potentially enabling account takeover.

User authentication data at risk.
Redirected to attacker-controlled website.
Enables account takeover.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in IBM API Connect's sign-in process requires immediate attention from teams managing API gateways and authentication systems. The first step is to inventory all instances of the affected software, determine their exposure to the internet, and identify their business criticality. Once these instances are cataloged, the accountable owners within platform, security, or infrastructure teams must be identified to plan remediation.

Ownership: Platform and security teams.
Verify: Internet-facing instances and their reachability.
Action: Plan remediation and coordinate with vendor.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is IBM API Connect?

IBM API Connect is an enterprise-grade platform used to create, manage, secure, and monitor APIs across various environments. It acts as an API gateway, facilitating communication between services and handling authentication for developers and end-users. Because it manages access to sensitive data and services, it is typically deployed as an edge service to process both internal and external traffic.

What does open redirect mean for CVE-2026-17297?

This vulnerability is classified as CWE-601: URL Redirection to Untrusted Site. It occurs when an application accepts a user-supplied URL for redirection without validating that the destination is safe. In the context of this CVE, the sign-in process fails to restrict where a user is sent after authenticating, allowing an attacker to manipulate the redirect path to capture sensitive authentication data.

How is this vulnerability triggered?

An attacker must trick a legitimate user into clicking a specifically crafted link that initiates the sign-in process. The vulnerability is triggered when the authentication flow concludes and the system sends the user to the malicious URL provided in the initial link. Simply accessing the IBM API Connect interface without interacting with a manipulated sign-in request does not trigger this flaw.

Is my IBM API Connect instance at risk?

Halo Surface Signal indicates that IBM API Connect is often deployed as a public-facing edge service. If your installation is accessible via the internet to handle external API traffic or developer portal logins, it is at higher risk. Systems that are strictly isolated within a private, internal-only network have a reduced attack surface compared to those exposed to the open web.

What should I do if I use the affected software?

Begin by creating a comprehensive inventory of all IBM API Connect instances in your environment. Prioritize those that are internet-facing, as these represent the greatest risk for unauthorized access. Coordinate with your platform and security teams to confirm the software versions in use and monitor official IBM support channels for the release of security updates or configuration guidance.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.