External risk intelligence

IBM API Connect Arbitrary File Read and SSRF Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-17299

IBM API Connect is a gateway and management platform designed to handle external API traffic. Because it acts as an edge service for organizations to expose, manage, and secure APIs, its endpoints are commonly deployed in internet-facing configurations, making the vulnerable component reachable in standard API gateway deployments.

Server-Side Request Forgery

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

This advisory highlights a critical vulnerability affecting IBM API Connect, a platform used for managing and securing APIs. The issue allows authenticated users to potentially read sensitive files and execute server-side requests, posing a risk to data and system integrity. The main concern is confirming relevance and exposure within our environment.

Unrestricted external references in API definitions.
Could allow unauthorized file access and requests.
Verify if IBM API Connect is in use.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by submitting a specially crafted definition to IBM API Connect. Because the system does not sufficiently restrict externally referenced content within these definitions, the attacker can trick the API Connect into retrieving and returning arbitrary files from the server, and potentially make requests to other servers on the network. This could lead to the exposure of sensitive information or unauthorized access to internal resources.

Authenticated access to IBM API Connect is required.
Submitting a definition with unrestricted external references.
Arbitrary file reads and server-side request forgery.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an authenticated attacker to read sensitive files from the server and initiate requests to internal or external resources. This is possible when the system processes external references in submitted definitions without sufficient restrictions, potentially exposing retrieved content back to the attacker.

Sensitive files on the server.
Unrestricted external reference resolution.
Unauthorized data access and SSRF.

Operational Fix

Recommended remediation, mitigation, and detection steps

IBM API Connect is likely owned by platform or infrastructure teams responsible for API management. The first step is to identify all instances of API Connect, determine their reachability and business criticality, and then locate the accountable owner to plan remediation based on the identified risk.

Platform or infrastructure teams own this.
Verify instance reachability and criticality.
Plan remediation based on risk.

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 used for?

IBM API Connect is an enterprise platform used to create, manage, secure, and monitor APIs throughout their lifecycle. It serves as a gateway that acts as a traffic controller between external clients and internal backend services, ensuring that API calls are authenticated, throttled, and routed correctly.

What does CWE-918 mean in the context of CVE-2026-17299?

CWE-918 refers to Server-Side Request Forgery (SSRF). In this CVE, the vulnerability occurs because the software fails to properly validate external references within submitted API definitions. This flaw allows an attacker to manipulate the system into making unauthorized requests to internal network resources or reading sensitive files from the local server.

How can an attacker trigger this vulnerability?

An attacker triggers this by submitting a specially crafted API definition to the system. The vulnerability relies on the software processing these definitions without sufficient restrictions on external references. It is important to note that simply visiting the management interface does not trigger the bug; it requires the active submission of malicious definition content.

Why should I care if my IBM API Connect instance is internet-facing?

Halo Surface Signal notes that IBM API Connect is designed to handle external API traffic and is commonly deployed in edge configurations. If your instance is internet-facing, it is more reachable by remote actors, increasing the risk that they could use authenticated access to exploit this flaw and reach internal network segments.

Do I need to check my environment for this CVE?

Yes. Start by identifying all instances of IBM API Connect within your infrastructure and determining who owns them. Verify the reachability and business criticality of each instance, then coordinate with the responsible platform or infrastructure teams to review security updates and plan your remediation strategy.

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.