IBM API Connect Authentication Bypass Vulnerability

Published: December 31, 2025
Severity Level: CRITICAL (9.8/10)
CVE ID: CVE-2025-13915

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Executive Summary

IBM has issued an urgent security warning regarding a critical authentication bypass vulnerability in IBM API Connect.
This flaw allows attackers to gain unauthorized remote access to enterprise applications without credentials.

The vulnerability affects hundreds of organizations across:

• Banking
• Healthcare
• Retail
• Telecommunications

Immediate patching is required.

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What is IBM API Connect?

IBM API Connect is a widely deployed enterprise API gateway used to:

• Develop APIs
• Test APIs
• Manage APIs
• Control access to internal services

It supports:

• On-premises deployments
• Cloud deployments
• Hybrid environments

This makes it a core component of modern enterprise architectures.

Common Users of IBM API Connect

• Banking and financial services institutions
• Healthcare providers and medical organizations
• Retail and e-commerce companies
• Telecommunications providers
• Government and public sector agencies

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The Vulnerability: CVE-2025-13915

Technical Details

• Vulnerability Type: Authentication Bypass (CWE-305)
• CVSS Score: 9.8 / 10 (CRITICAL)
• Attack Vector: Network-based (remote)
• Exploit Complexity: Low
• Authentication Required: None
• User Interaction: Not required

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Affected Versions

The following IBM API Connect versions are vulnerable:

• 10.0.11.0
• 10.0.8.0 through 10.0.8.5

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Attack Scenario

An attacker can exploit this vulnerability to bypass authentication controls, gaining unauthorized access to exposed applications without:

• Valid user credentials
• Multi-factor authentication (MFA)
• Any form of prior access

This enables full compromise of API-exposed services.

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Vendor Statement

According to IBM’s official security advisory:

"IBM API Connect could allow a remote attacker to bypass authentication mechanisms and gain unauthorized access to the application. IBM strongly recommends addressing the vulnerability now by upgrading."

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Recommended Action

"Customers unable to install the interim fix should disable self-service sign-up on their Developer Portal if enabled, which will help minimize their exposure to this vulnerability."

Mitigation Steps

• Patch immediately using IBM’s official security updates
• Restrict external access until patches are applied
• Monitor logs for suspicious unauthenticated activity
• Conduct a post-patch security review

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