External risk intelligence

IBM API Connect Authentication Bypass Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-13915

IBM API Connect is an API management solution designed to be deployed at the network edge to manage, secure, and expose APIs to the public internet. As an identity-aware gateway and API management interface, it is typically public-facing by design in normal deployment patterns.

Ibm Api Connect

10.0.8.0 to 10.0.8.510.0.11.0

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

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in IBM API Connect that could allow unauthorized access to the application by bypassing its authentication controls. The technology affected is used for managing APIs, and this flaw could potentially expose sensitive operations or data. The primary concern is confirming if your organization utilizes this specific IBM product and, if so, investigating its exposure.

Authentication bypass in API management software.
Protects against unauthorized system access.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted requests to an exposed IBM API Connect instance. This could allow them to bypass security checks and gain unauthorized access to the application's sensitive data and functionalities.

Entry Condition: Unauthenticated network access to the target.
Trigger Point: Specially crafted requests to the API gateway.
Resulting Risk: Unauthorized access and data compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated remote attacker to bypass authentication and gain unauthorized access to IBM API Connect. When supported by the advisory, this could expose sensitive information, allow for unauthorized modifications, or disrupt service availability for APIs managed by the affected system.

Unauthorized access to managed APIs.
Bypass authentication mechanisms remotely.
Compromised service availability or data integrity.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts IBM API Connect, a product often deployed at the network edge to manage public-facing APIs. Teams responsible for API management, application platforms, and network security should collaborate to address this critical issue. The first practical step is to identify all instances of the affected IBM API Connect versions, assess their external reachability and business criticality, and locate the accountable system owner to plan remediation.

Ownership: API management and platform teams.
Verify: Reachability and business criticality.
Action: Plan and coordinate remediation.

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 throughout their lifecycle. It functions as a gateway that controls how internal and external services communicate, ensuring that API traffic is properly managed and protected as it moves between applications and end-users.

What does CVE-2025-13915 mean?

This vulnerability is an authentication bypass, classified as CWE-305. In plain terms, it means the software's security checkpoint that verifies identity can be circumvented. Instead of requiring valid credentials, the system may allow an attacker to bypass these checks entirely and access the application as if they were an authorized user.

How is this vulnerability triggered?

An attacker triggers this flaw by sending specially crafted network requests to the API gateway. This does not require any prior authentication or special user permissions. It is important to note that standard, legitimate API traffic does not trigger this issue; the vulnerability is specifically activated by malicious inputs designed to deceive the authentication mechanism.

Why is this CVE high priority for my team?

Halo Surface Signal indicates that IBM API Connect is typically deployed at the network edge to expose APIs to the public internet. Because the software is designed to be public-facing, any instance connected to the internet is highly reachable by remote attackers, making the potential for unauthorized access a significant risk to your environment.

Do I need to take action if I use this software?

Yes. Start by creating an inventory of all IBM API Connect instances in your environment to see if they match the affected versions. Once you locate these systems, evaluate which ones are reachable from the internet and determine their business importance. Coordinate with your platform and security teams to prioritize these assets for official vendor updates.

References

www.ibm.com/support/pages/node/7255149

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.